There are 18,446,744,073,709,551,615 (18 quintillion+) positions for a 64-bit word. How many of those positions have actually occurred?
If 1 billion computers generated ~584 64-bit values each second, then you'd see every 64-bit word after about one year, so this seems possible.
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However, Microsoft Word is the same set of 64-bit values no matter how many computers it runs on. I'm not convinced that the corpus of software is large and varied enough to have used all 64-bit values. It would have to come down to data and memory addresses.
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I don't think memory addresses would get you there, because with virtual memory most addresses are probably pretty low. I don't think there are computers out there with 16 exabytes of RAM processing varied enough data. But I could be wrong?
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I suspect when it comes to data there are pockets of 64-bit values that are much more common than others. Perhaps there are some pockets of 64-bit values that exist only as mathematical values and have never been processed by a computer!
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