General fact: 16963 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 16963 is an uninteresting number.
Trivia: 16963 is an unremarkable number.
Historical date: June 10th is the day in 1980 that the African National Congress in South Africa publishes a call to fight from their imprisoned leader Nelson Mandela.