165_(number) Knowpia

165 (one hundred [and] sixty-five) is the natural number following 164 and preceding 166.

In mathematics edit

165 is:

an odd number, a composite number, and a deficient number.
a sphenic number.
a tetrahedral number^[1]
the sum of the sums of the divisors of the first 14 positive integers.^[2]
a self number in base 10.
a palindromic number in binary (10100101₂) and bases 14 (BB₁₄), 32 (55₃₂) and 54 (33₅₄).
a unique period in base 2.

Caproni Ca.165 Italian fighter aircraft developed before World War II
USNS American Explorer (T-AOT-165) was a United States Navy tanker, part of the U.S. Reserve Fleet, Beaumont, Texas
USS Bonita (SS-165) was a United States Navy Barracuda-class submarine during World War II
USS Bullock (AK-165) was a United States Navy Alamosa-class cargo ship during World War II
USS Counsel (AM-165) was a United States Navy Admirable-class minesweeper during World War II
USS Counsel (AM-165) was a United States Navy Haskell-class attack transport during World War II
USS Flicker (IX-165) was a United States Navy minesweeper during World War II
USS Georgetown (AG-165) was a United States Navy Oxford-class technical research ship following World War II
USS Meredith (DD-165) was a United States Navy Wickes-class destroyer during World War I
USS Parks (DE-165) was a United States Navy Cannon-class destroyer escort during World War II
USS Prince Georges (AP-165) was a United States Navy Crater-class transport and cargo ship during World War II
USS Wenonah (SP-165) was a United States Navy yacht during World War I
The 165 Squadron, Republic of Singapore Air Force Air Defence Operations Command, Republic of Singapore Air Force

British Rail Class 165
The Blériot 165 was a French four-engine biplane airliner of the early 1920s
The Cessna 165 single-engine plane of the 1930s
LOT Polish Airlines Flight 165, en route from Warsaw to Cracow Balice airport crashed during a snowstorm on April 2, 1969

165 is also:

The year AD 165 or 165 BC
165 AH is a year in the Islamic calendar that corresponds to 781 – 782 CE
The atomic number of an element temporarily called Unhexpentium
G.165 is a Telecommunication Standardization Sector standard for echo cancellers, used in telephony
The human gene Zinc finger protein 165, or ZNF165

^ "Sloane's A000292 : Tetrahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
^ Sloane, N. J. A. (ed.). "Sequence A024916 (sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.