The number 2^64 is not the limit itself here. What I meant with it is the number of unique digits combinations we can have at 64 slots. Your calculation would r

The number 2^64 is not the limit itself here. What I meant with it is the number of unique digits combinations we can have at 64 slots. Your calculation would rather be https://www.wolframalpha.com/input/?i=99999999999999999999%2F%28population+of+the+world+in+2050%29 https://www.wolframalpha.com/input/?i=99999999999999999999%2.... But this is not what I meant. What can you do best when you run out of unique combinations and the CPU can't handle more than 64 slots at a time? Upgrade to 128-bit architecture is not the answer I'm seeking.