Recognised as Decimal number

666.5

Positive
Decimal
1 d.p.
Exact fraction
4 s.f.

666.5 is a decimal number equal to 1,333⁄2. It lies between 666 and 667, and as a percentage it is 66,650%.

Number properties

Absolute value666.5

SignPositive

Integer part666

Fractional part0.5

Decimal places1

Floor666

Ceiling667

Rounded to nearest667

Truncated666

Fractions & ratios

As a fraction1,333/2exact

Ratio1,333 : 2

As a percentage66,650%

Reciprocal0.0015003751≈

Arithmetic

Double1,333

Half333.25

Square444,222.25

Cube296,074,129.625

Square root25.8166612869≈

Cube root8.735076603≈

Negation-666.5

Natural logarithm6.5020401396≈

Logarithm base 102.8238001537≈

Representations

Decimal666.5

Scientific notation6.665 × 10^2

Exponential6.665e+2

IEEE 754 binary64 (hex)0x4084D40000000000the exact 64-bit pattern stored

IEEE 754 binary32 (hex)0x4426A00032-bit single precision, may lose accuracy

Stored as666.5the nearest binary64 value to what you typed

Rounding & precision

Significant figures as written4counted from the digits as typed, not from the value

To 0 decimal places667

To 1 decimal place666.5

To 2 decimal places666.50

To 3 decimal places666.500

To 4 decimal places666.5000

To 1 significant figure7e+2

To 2 significant figures6.7e+2

To 3 significant figures667

To 4 significant figures666.5

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