Fait général: 6658 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 6658 is an uninteresting number.
Culture générale: 6658 is an unremarkable number.
Date historique: March 24th is the day in 1603 that Tokugawa Ieyasu is granted the title of shogun from Emperor Go-Yozei, and establishes the Tokugawa Shogunate in Edo, Japan.