"Aitken could recite Pi to 707 decimal places", and how about 22.514? <a href="https://www.youtube.com/watch?v=z22H89rIMHk" rel="nofollow">https://www.youtube.com/watch?v=z22H89rIMHk</a> @ 8:00 (although the entire documentary is great)
Sounds like a remarkable guy. But, and not to nitpick, but calling him "the greatest mathematician of his era" is a bit ridiculous. This was the era of Hilbert, von Neumann, Gödel, Turing, Einstein, Ramanujan...