Fatto generale: 66490 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 66490 is a boring number.
Trivia: 66490 is an unremarkable number.
Data storica: January 15th is the day in 1936 that the first building to be completely covered in glass, built for the Owens-Illinois Glass Company, is completed in Toledo, Ohio.