Fatto generale: 6599 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 6599 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 6599 is a boring number.
Data storica: January 24th is the day in 1918 that the Gregorian calendar is introduced in Russia by decree of the Council of People's Commissars effective February 14(NS).