Fatto generale: 6006 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 6006 is the number of intersections when all the diagonals of a regular 21-gon are drawn.
Trivia: 6006 is an unremarkable number.
Data storica: June 10th is the day in 1918 that the Austro-Hungarian battleship SMS Szent István sinks after being torpedoed by an Italian MAS motorboat.