Fatto generale: 6654 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 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 an unremarkable number.
Data storica: March 20th is the day in 1951 that Fujiyoshida, a city located in Yamanashi Prefecture, Japan, in the center of the Japanese main island of Honshū is founded.