You joke but I found this interesting (from https://en.wikipedia.org/wiki/Metal_oxide_semiconductor):

> It is the basic building block of modern electronics, and the most frequently manufactured device in history, with an estimated total of 13 sextillion (1.3×10^22) MOSFETs manufactured between 1960 and 2018

64 bits can address 1.8x10^19 bytes. Of course there is not a 1:1 correlation between mosfets ever made and bytes of ram usable today but it's curiously close to the 64-bit limit so you could say 64 bits is just enough to address every byte in the world.

I wonder how much magnetic storage would add to that?