Mathematical fact: 2663 is the number of digits of the 20^{th} perfect number.
Trivia: 2663 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: April 16th is the day in 1992 that the Katina P. runs aground off of Maputo, Mozambique and 60,000 tons of crude oil spill into the ocean.