Recognised as Physical constant
Euler's number
- e
- Exact by definition
- mathematical
Euler's number (e) is 2.718281828459. The base of the natural logarithm. Irrational and transcendental. Values follow CODATA 2018 (2019 SI redefinition).
Value
Value2.71828182845905
Scientific notation2.71828182846 × 10^0
Unitdimensionless
Symbole
ExactnessExact by definitionThe base of the natural logarithm. Irrational and transcendental.
Reciprocal3.678794412 × 10^-1
Order of magnitude10^0
Multiples
× 25.43656366 × 10^0
× 102.71828183 × 10^1
× 1002.71828183 × 10^2
× 1,0002.71828183 × 10^3
× 0.51.35914091 × 10^0
× 0.12.71828183 × 10^-1
Provenance
DatasetCODATA 2018 (2019 SI redefinition)
Categorymathematical
Why it mattersThe base of the natural logarithm. Irrational and transcendental.
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Other constants
The number itself
Also reads as
U+0065 (unicode character)
- U+0065
- e
- Lowercase letter
U+0065 is code point 101 (e), a lowercase letter in the Basic Latin (ASCII) block of the Basic Multilingual Plane. It takes 1 byte in UTF-8 and 1 unit in UTF-16.
Identity
Code pointU+0065
Decimal101
Charactere
General categoryLowercase letter
BlockBasic Latin (ASCII)
PlaneBasic Multilingual Planeplane 0
Official nameNot includedthe Unicode Character Database is not bundled; a stale copy would be worse than none
Encodings
UTF-8651 byte
UTF-160065a single unit
UTF-3200000065
Binary1100101
Bytes in UTF-8 vs UTF-161 vs 2UTF-16 is not always smaller, even for non-Latin text
Writing it in code
HTML numeric entitye
HTML hex entitye
CSS escape\0065
JavaScript\u0065
Python\u0065
Percent-encoded (URL)%65
Things that catch people out
JavaScript string length1
Needs a surrogate pairNo
Safe in a URL unescapedYes
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