Dickson's "History of the Theory of Numbers" is not only old (1919), but it reviews material which is even older. I found it extremely useful when calculating some family Gromov-Witten invariants in a recent paper with Jarek Kedra - while performing the arithmetic manipulations in Section 8, we would have been lost without the wealth of formulae in Dickson. I've no doubt the material appears elsewhere, but Dickson has a comprehensive and carefully historical approach.