Fatto generale: 16 is the number of teams that qualified for the finals of the FIFA World Cup from 1934 through 1978 (although for various reasons, only 15 competed in the 1938 and 1950 finals).
Fatto matematico: 16 is the only integer that equals mn and nm, for some unequal integers m and n (m = 4, n = 2, or vice versa).
Trivia: 16 is the minimum age that one can drop out of school in most states of the US (however, restrictions apply and vary depending on state).
Data storica: January 16th is the day in 27 BC that Gaius Julius Caesar Octavianus is granted the title Augustus by the Roman Senate, marking the beginning of the Roman Empire.