Fatto generale: 6579 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 6579 is the number of ways to color the vertices of a triangle with 27 colors, up to rotation.
Trivia: 6579 is an unremarkable number.
Data storica: January 4th is the day in 1965 that United States President Lyndon B. Johnson proclaims his "Great Society" during his State of the Union address.