Fatto generale: 156 is the number of years that Hong Kong was under British colony rule.
Fatto matematico: 156 is a pronic number, a dodecagonal number, a refactorable number and a Harshad number.
Trivia: 156 is the number of hourly gongs a clock strikes in one day (78 AM gongs and 78 PM gongs).
Data storica: June 4th is the day in 1986 that Jonathan Pollard pleads guilty to espionage for selling top secret United States military intelligence to Israel.