Fatto generale: 1577 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1577 is a boring number.
Trivia: 1577 is a boring number.
Data storica: April 25th is the day in 1849 that the Governor General of Canada, Lord Elgin, signs the Rebellion Losses Bill, outraging Montreal's English population and triggering the Montreal Riots.