Even if you follow broomdusters advice, you still have a big problem. The internal numbers presentation automatically changes a number to floating point if it gets too big. Anding floating point numbers is quite useless as you can see here:
$maskResult = 4000000000000000 & 4000000000000000;
$maskResult = 1000000000000000 & 4000000000000000;
If you want to use really large integers you need bigint or Math:BigInt
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