Fatto generale: 552 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 552 is the number of prime knots with 11 crossings.
Trivia: 552 is an unremarkable number.
Data storica: July 5th is the day in 1962 that the Late Late Show, the world's longest-running chat show by the same broadcaster, airs on RTÉ One for the first time.