Hecho general: 2525 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 2525 is a boring number.
Trivia: 2525 is an unremarkable number.
Fecha histórica: November 29th is the day in 1847 that the Sonderbund is defeated by the joint forces of other Swiss cantons under General Guillaume-Henri Dufour.