Fatto generale: 2537 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 2537 is an unremarkable number.
Trivia: 2537 is a boring number.
Data storica: December 11th is the day in 1934 that Bill Wilson, co-founder of Alcoholics Anonymous, takes his last drink and enters treatment for the last time.