Hecho general: 6455 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 6455 is the smallest value of n for which the n^{th} prime begins with the digits of n.
Trivia: 6455 is an unremarkable number.
Fecha histórica: September 2nd is the day in 1649 that the Italian city of Castro is completely destroyed by the forces of Pope Innocent X, ending the Wars of Castro.