Fait général: 15525 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 15525 is a boring number.
Culture générale: 15525 is an uninteresting number.
Date historique: July 3rd is the day in 1886 that the New York Tribune becomes the first newspaper to use a linotype machine, eliminating typesetting by hand.