General fact: 775 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 775 is the smallest number whose 9^{th} power has 26 digits.
Trivia: 775 is a boring number.
Historical date: February 13th is the day in 1575 that Henry III of France is crowned at Rheims, marrying Louise de Lorraine-Vaudémont on the same day.