Fatto generale: 99518 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 99518 is an unremarkable number.
Trivia: 99518 is an unremarkable number.
Data storica: June 20th is the day in 1956 that a Venezuelan Super-Constellation crashes in the Atlantic Ocean off Asbury Park, New Jersey, killing 74 people.