Fatto generale: 156 is the number of hourly gongs a clock strikes in one day (78 AM gongs and 78 PM gongs).
Fatto matematico: 156 is a pronic number, a dodecagonal number, a refactorable number and a Harshad number.
Trivia: 156 is the number of strikes a clock will strike in the course of a day.
Data storica: June 4th is the day in 1989 that Ali Khamenei is elected the new Supreme Leader of Islamic republic of Iran by the Assembly of Experts after the death of Ayatollah Ruhollah Khomeini.