Fatto matematico: 9660 is a truncated tetrahedral number.
Trivia: 9660 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: June 12th is the day in 1963 that Civil rights leader Medgar Evers is murdered in front of his home in Jackson, Mississippi by Ku Klux Klan member Byron De La Beckwith.