166 (one hundred [and] sixty-six) is the natural number following 165 and preceding 167. In mathematics 166 is an even number and a composite number. It is a centered triangular number. Given 166, the Mertens function returns 0. 166 is a Smith number in base 10. In astronomy 166 Rhodope is a dark main belt asteroid, in the Adeona family of asteroids 166P/NEAT is a periodic comet and centaur in the outer Solar System HD 166 is the 6th magnitude star in the constellation Andromeda In the military 166th Signal Photo Company was the official photo unit in the 89th Division of George Patton's Third Army in World War II Convoy ON-166 was the 166th of the numbered ON series of merchant ship convoys outbound from the British Isles to North America departing February 11, 1943 Marine Medium Helicopter Squadron 166 is a United States Marine Corps helicopter was a United States Coast Guard cutter during World War II was a United States Navy yacht. She was the first American vessel lost in World War I was a United States Navy during World War II was a United States Navy during the World War I was a United States Navy during World War II was a United States Navy ship during World War II USS Jamestown (AGTR-3/AG-166) was a United States Navy Oxford-class technical research ship following World War II In sports Sam Thompson’s 166 RBIs in 1887 stood as a Major League Baseball record until Babe Ruth broke the record in 1921 In transportation British Rail Class 166 The now-defunct elevated IRT Third Avenue Line, 166th Street station in the Bronx, New York London Buses route 166 Piaggio P.166 is a twin-engined push prop-driven utility aircraft developed by the Italian aircraft manufacturer Piaggio Banat Air Flight 166 crashed on take-off en route from Romania on December 13, 1995 Alfa Romeo 166 and 166 2.4 JTD produced from 1998 to 2007 Ferrari 166 model cars produced from 1948 to 1953 Ferrari 166 Inter (1949) Coachbuilt street coupe and cabriolet In other fields 166 is also: The year AD 166 or 166 BC The atomic number of an element temporarily called Unhexhexium See also List of highways numbered 166 United States Supreme Court cases, Volume 166 United Nations Security Council Resolution 166 External links Number Facts and Trivia: 166 The Number 166 VirtueScience: 166 166th Street (3rd Avenue El) References Integers