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

$MaxNumber
gives the maximum arbitrary-precision number that can be represented on a particular computer system.
The maximum number representable on this computer system:
Larger numbers yield overflows:
The maximum number representable on this computer system:
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Click for copyable input
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Larger numbers yield overflows:
In[1]:=
Click for copyable input
Out[1]=
$MaxNumber has the maximal possible exponent and all significant bits set to 1:
$MaxNumber×$MinNumber is approximately 1:
$MaxNumber is not a machine number:
It does have precision equivalent to that of machine numbers:
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