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$ perl -le'print ~0'
18446744073709551615
...
$ perl -le'print +( 2 ** 64 ) - 1'
1.84467440737096e+19

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$ perl -le'print 2 ** 49'
562949953421312
...
$ perl -le'print 2 ** 50'
1.12589990684262e+15