The authors probably didn't meant it, but this is surprisingly realistic of math geniuses (see stories of Grothendieck Prime and Weyl in the following thread)
My math is rusty enough to find it helpful to explicate that 2*5 is the complete factorization to primes of 10, and our customary arithmetic base for numbers written on the page is likewise 10.
I like the Einstein quote about the speed of light - some smartass asked him to recite it, and he’s basically like “I don’t memorize trivial information that’s easily looked up in books”
Could be totally apocryphal, but I like the sentiment.