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based on an earlier version of the Wolfram Language.
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$MaxMachineNumber

$MaxMachineNumber
is the largest machine-precision number that can be used on a particular computer system.
  • Numbers larger than $MaxMachineNumber are always represented in arbitrary-precision form.
  • $MaxMachineNumber is typically 2n, where n is the maximum exponent that can be used in the internal representation of machine-precision numbers.
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