Fatto generale: 86665 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 86665 is a boring number.
Trivia: 86665 is a boring number.
Data storica: April 12th is the day in 1820 that Alexander Ypsilantis is declared leader of Filiki Eteria, a secret organization to overthrow Ottoman rule over Greece.