Roughly 350 million PCs were sold per year in in 2013. https://www.wsj.com/articles/SB10001424127887324695104578414973888155516 … and there are some estimates that 1.3 billion PCs were in use in 2019 https://www.statista.com/statistics/610271/worldwide-personal-computers-installed-base/ … This does not account for smart phones or other computing devices.
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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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