Passenger 57

The Tenth Doctor claimed to be passenger 57 to a Heavenly Host on Max Capricorn's Titanic. (TV: Voyage of the Damned)

Behind the scenes
Though not clarified in the episode, the Doctor's identification is a reference to the film starring Wesley Snipes. Indeed, it was considered noteworthy enough that the original 2007 edition of Doctor Who: The Encyclopedia cited the phrase as a potential entry in a future edition.