Recognised as Number
556
- Positive
- Even
- Composite
- 3 digits
556 is an even 3-digit integer and a composite number. It has 6 divisors and a digital root of 7.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value556
Digit count3
Digit sum16
Digit product150
Multiplicative persistence2times the digit product can be taken before one digit is left
Digital root7repeated digit sum
PalindromicNoreads differently backwards
Happy numberYessquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2^2 × 139
Distinct prime factors22, 139
Number of divisors6
Sum of divisors σ(n)980
Aliquot sum424sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)276integers below n that share no factor with it
Carmichael function λ(n)138the smallest exponent with aˣ ≡ 1 for every unit; smaller than φ(n) = 276
Möbius function μ(n)0zero, because a prime divides n twice
SquarefreeNohas a repeated prime factor
All divisors1, 2, 4, 139, 278, 5566 in total
Arithmetic
Representations
Decimal556
Binary100010110010 bits
Octal1054
Hexadecimal22C
Base 36FG
Roman numeralDLVI
In wordsfive hundred and fifty-six
Ordinalfive hundred and fifty-sixth
Scientific notation5.56 × 10^2
Engineering notation556
In other bases
Ternary202121base 3; the most digit-efficient integer base after e: 6 digits
Quinary4211base 5; one hand: 4 digits
Septenary1423base 7: 4 digits
Nonary677base 9; each digit is two ternary digits: 3 digits
Duodecimal3a4base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 3 digits
Vigesimal17gbase 20; hands and feet, and the Mayan and Yoruba systems: 3 digits
Sexagesimal9:16base 60; Babylonian, and still how an hour and a circle are divided: 2 digits
Balanced ternary1T10TT1digits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary11001111100base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign
Bit-level
0000001000101100
Bit length10 bitsto write the magnitude
Set bits4the population count, or Hamming weight
Zero bits6within that length
Bit parityeven4 set bits, so even; not the same as the number itself being even
Highest set bitbit 9worth 512
Lowest set bitbit 22 trailing zeros
Power of twoNo
Bytes202 2c
Gray code1100111010n XOR (n >> 1); successive values differ in exactly one bit
At each machine width
16-bit0000001000101100
32-bit00000000000000000000001000101100
64-bit0000000000000000000000000000000000000000000000000000001000101100
One's complement1111110111010011at 16 bits, every bit flipped
Bits reversed0011010001000000at 16 bits
Rotated left by 10000010001011000at 16 bits, wrapping
Shifted left by 110001011000= 1,112, no wrap
Shifted right by 1100010110= 278, discarding the low bit
These bits as a double2.74700499 × 10^-321≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)
Nearest landmarks
Powers & multiples
556 to the power 2309,136
556 to the power 3171,879,616
556 to the power 495,565,066,496
556 to the power 553,134,176,971,776
First ten multiples556, 1,112, 1,668, 2,224, 2,780, 3,336, 3,892, 4,448, 5,004, 5,560
Powers of twoBetween 2^9 (512) and 2^10 (1,024)
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 1
Divisible by 4Yes
Divisible by 5No, remainder 1
Divisible by 6No, remainder 4
Divisible by 7No, remainder 3
Divisible by 8No, remainder 4
Divisible by 9No, remainder 7
Divisible by 10No, remainder 6
Divisible by 11No, remainder 6
Divisible by 12No, remainder 4
Divisible by 100No, remainder 56
Collatz (3n + 1) trajectory
Steps to reach 143the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps556 → 278 → 139 → 418 → 209 → 628 → 314 → 157 → 472 → 236 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage55,600%
556% as a decimal5.56
556% of 100556
556% of 1,0005,560
As a fraction of 100556/100
Read another way
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Derived from 556
Other readings
Also reads as
#555566 (colour)
- #555566
- Blue
- Dark
- Nearest: Dim grey
#555566 is a blue with RGB values 85, 85, 102 and HSL 240°, 9%, 37%. It is a dark colour, so white text on it reaches 7.3:1 contrast (AAA for normal text). The nearest named colour is Dim grey.
Colour values
#555566#555566
HEX#555566
HEX (short)#556
RGBrgb(85, 85, 102)
RGB (0–1)0.3333, 0.3333, 0.4
RGB percentages33.3%, 33.3%, 40%
HSLhsl(240, 9.1%, 36.7%)
HSV / HSBhsv(240, 16.7%, 40%)
CMYK16.7%, 16.7%, 0%, 60%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,592,422
CSS custom property--colour: #555566;
Brightness & contrast
Relative luminance0.09388WCAG 2.x, 0 is black and 1 is white
Perceived brightness87.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.3:1
Contrast with white7.3:1WCAG normal text: AAA
Contrast with black2.88:1WCAG normal text: Fail
Greyscale equivalent#565656
Inverted#AAAA99
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text7.3:1WCAG large text: AAA
Contrast with black, large text2.88:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#666655
Analogous#555E66, #5E5566
Triadic#665555, #556655
Split complementary#665E55, #5E6655
Tetradic#66555E, #666655, #55665E
Tints, shades & saturation
Channel breakdown
R85
G85
B102
Red85 (33.3%)
Green85 (33.3%)
Blue102 (40%)
Hue240°
Saturation (HSL)9.09%
Lightness36.67%
Dominant channelBlue
Hex per channelR 55 · G 55 · B 66
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Harmonies
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