This is documentation for Mathematica 7, which was
based on an earlier version of the Wolfram Language.
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Number Digits
Mathematica 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
IntegerString digits of an integer as a string
BaseForm display a number in base b
NumberForm  ▪ PaddedForm  ▪ ...
BitAnd  ▪ BitOr  ▪ BitXor  ▪ BitNot  ▪ BitShiftLeft  ▪ BitSet  ▪ ...