General fact: 6544 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 6544 is a number n whose 9^{th} root has a decimal part that begins with the digits of n.
Trivia: 6544 is an uninteresting number.
Historical date: November 30th is the day in 1872 that the first-ever international football match takes place at Hamilton Crescent, Glasgow, between Scotland and England.