Hecho matemático: 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 boring number.
Fecha histórica: October 14th is the day in 1968 that the first live telecast from a manned spacecraft, the Apollo 7, launched by the National Aeronautics and Space Administration of the U.S.A.