Hecho general: 63523 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 63523 is an unremarkable number.
Trivia: 63523 is a boring number.
Fecha histórica: December 1st is the day in 1952 that the New York Daily News reports the news of Christine Jorgenson, the first notable case of sexual reassignment surgery.