“Humanity has always been entranced by big numbers — the bigger the better. This fascinating exploration of the giants of the mathematical world is clear, informative, and immensely readable. Wonderful!”

– Ian Stewart

“A charming tour through the realm of the very, very, very numerous, from the ancient world through the distant future.” 

– Jordan Ellenberg

“Elwes provides a phenomenal scenic tour of googology (the study of huge numbers), covering everything from ancient Mayan and Babylonian numeral systems to the scale of the universe to the dizzyingly fast-growing functions of mathematical logic. I wish I had written this book.”

– Scott Aaronson

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