General fact: 6494 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 6494 is a boring number.
Trivia: 6494 is an uninteresting number.
Historical date: October 11th is the day in 1634 that the Burchardi flood – "the second Grote Mandrenke" killed around 15,000 men in North Friesland, Denmark and Germany.