Fait mathématique: 66626 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 66626 is an unremarkable number.
Date historique: May 31st is the day in 1578 that Martin Frobisher sails from Harwich, England to Frobisher Bay, Canada, eventually to mine fool's gold, used to pave streets in London.