Fatto generale: 653 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 653 is the only known prime for which 5 is neither a primitive root or a quadratic residue of 4n^{2}+1.
Trivia: 653 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: October 14th is the day in 1910 that the English aviator Claude Grahame-White lands his Farman Aircraft biplane on Executive Avenue near the White House in Washington, D.C..