That is unfortunate. With only two prime factors, one of which being 13, base 26 is even worse than base 10, and it doesn't even have anatomical coincidence to recommend it. Much better to use base 36 -- we have a ready made character set for it by simply adding the digits to the 26 alphabetic characters. This gives us many more integer prime factors. Not as good as base 60, but better than base 26 and finger numbers.