Fatto generale: 6630 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 6630 is the number of triangles of any size contained in the triangle of side 29 on a triangular grid.
Trivia: 6630 is an unremarkable number.
Data storica: February 24th is the day in 1942 that the Battle of Los Angeles, one of the largest documented UFO sightings in history; the event lasted into the early hours of February 26, 1942.