166 (one hundred [and] sixty-six) is the natural number following 165 and preceding 167.
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.
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
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
USCGC Tamaroa (WMEC-166) was a United States Coast Guard cutter during World War II
USS Alcedo (SP-166) was a United States Navy yacht. She was the first American vessel lost in World War I
USS Baron (DE-166) was a United States Navy cannon class destroyer escort during World War II
USS Bush (DD-166) was a United States Navy Wickes class destroyer during the World War I
USS Cabell (AK-166) was a United States Navy Alamosa-class cargo ship during World War II
USS Fond du Lac (APA-166) was a United States Navy Haskell-class attack transport 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
Sam Thompson’s 166 RBIs in 1887 stood as a Major League Baseball record until Babe Ruth broke the record in 1921
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 1998–2007
Ferrari 166 model cars produced from 1948–1953
Ferrari 166 Inter (1949) Coachbuilt street coupe and cabriolet
166 is also:
The year AD 166 or 166 BC
The atomic number of an element temporarily called Unhexhexium
