The Wolfram Language can handle numbers of essentially unlimited length, in any base, using state-of-the-art platform-optimized algorithms, including several developed at Wolfram Research. For rational numbers, it uses number theoretic methods to efficiently find the exact forms of repeating digit sequences.

IntegerDigits — digits of an integer

RealDigits — digits of a real number

FromDigits — reconstruct a number from its digits

IntegerLength — total number of digits in an integer

DigitCount — count the number of occurrences of given digits

DigitSum — sum the digits of an integer

NumberDigit — extract a particular digit in a number

IntegerReverse — integer obtained by reversing digits

IntegerExponent  ▪  MantissaExponent  ▪  IntegerPart  ▪  Log10  ▪  Log2

NumberExpand — give a number expanded in positional notation

IntegerString — digits of an integer as a string

BaseForm — display a number in base b

NumberForm  ▪  PaddedForm  ▪  DecimalForm  ▪  PercentForm  ▪  ...

IntegerName — name of an integer (e.g. "thirty-five")

RomanNumeral  ▪  FromRomanNumeral

NumberDecompose — decompose into multiples of units (e.g. currency denominations)

NumberCompose — reconstruct a number from its decomposition

MixedRadix — represent mixed radix in all operations (e.g. hours, minutes, seconds)

Bitwise Operations »

BitAnd  ▪  BitOr  ▪  BitXor  ▪  BitNot  ▪  BitShiftLeft  ▪  BitSet  ▪  ...