Fatto generale: 6469 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 6469 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 6469 is an uninteresting number.
Data storica: September 16th is the day in 1966 that the Metropolitan Opera House opens at Lincoln Center in New York City with the world premiere of Samuel Barber's opera, Antony and Cleopatra.