General fact: 9666 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 9666 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 9666 is an unremarkable number.
Historical date: June 18th is the day in 1684 that the charter of the Massachusetts Bay Colony is revoked via a scire facias writ issued by an English court.