General fact: 6546 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 6546 is a boring number.
Trivia: 6546 is an uninteresting number.
Historical date: December 2nd is the day in 1775 that the USS Alfred becomes the first vessel to fly the Grand Union Flag (the precursor to the Stars and Stripes); the flag is hoisted by John Paul Jones.