Fatto generale: 8766 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 8766 is an uninteresting number.
Trivia: 8766 is an uninteresting number.
Data storica: December 31st is the day in 1999 that the United States Government hands control of the Panama Canal (as well all the adjacent land to the canal known as the Panama Canal Zone) to Panama.