At the time of writing, to my knowledge, the largest known prime number was ‘2

^{57,885,161}− 1’. This means 57,885,161 twos multiplied together, minus 1: which produces a number with over 17 million digits.

How large is this? It's very difficult to conceive of a number with 17 million digits. So, I came up with the following idea. Imagine trying to write it down. The fifth edition of my book will contain over 400 pages. Just to print all 17 million-plus digits in the largest known prime number would require ten books of that size!

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