Fatto generale: 6353 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 6353 is a boring number.
Trivia: 6353 is an unremarkable number.
Data storica: May 23rd is the day in 1813 that South American independence leader Simón Bolívar enters Mérida, leading the invasion of Venezuela, and is proclaimed El Libertador ("The Liberator").