Fatto generale: 2555 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 2555 is an unremarkable number.
Trivia: 2555 is an uninteresting number.
Data storica: December 29th is the day in 1996 that Guatemala and leaders of Guatemalan National Revolutionary Union sign a peace accord ending a 36-year civil war.