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What's also interesting is the existence of many profoundly gifted contemporaries in this same space of time, such as the Bernoulli's, Goldbach, LaGrange, just to name a few. He often corresponded with many of them as well.

Having studied Euler a little, I am at a loss to explain his work rate. Somehow I think such people are so far outside normal output for a human being and are under-explained. The guy could almost have been some other life-form wearing a disguise. JvN another of course.

True - none of my mathematics textbooks have the name 'Paul Erdős' mentioned in them.