Hecho matemático: 6654 is the smallest number whose decimal part of its 4^{th} root starts with the digits 0-9 in some order.
Trivia: 6654 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: March 20th is the day in 1964 that the precursor of the European Space Agency, ESRO (European Space Research Organization) is established per an agreement signed on June 14, 1962.