164 (one hundred [and] sixty-four) is the natural number following 163 and preceding 165.

In mathematics

164 is a zero of the Mertens function.

In base 10, 164 is the smallest number that can be expressed as a concatenation of two squares in two different ways: as 1 concatenate 64 or 16 concatenate 4.

In astronomy

• 164P/Christensen is a comet in the Solar System
• 164 Eva is a large and dark Main belt asteroid

In geography

• Chaplin no. 164, Saskatchewan in Saskatchewan, Canada

In the military

• USNS Kingsport (T-AG-164) was a cargo vessel during World War II
• USNS Petrolite (T-AO-164) was a T2 tanker during World War II
• USS Bass (SS-164) was a Barracuda-class submarine during World War II
• USS Brevard (AK-164) was an Alamosa-class cargo ship during World War II
• USS Control (AM-164) was an Admirable-class minesweeper during World War II
• USS Corundum (IX-164) was a Trefoil-class concrete barge during World War II
• USS Crosby (DD-164) was a Wickes-class destroyer during World War II
• USS Edgecombe (APA-164) was a Haskell-class attack transport during World War II
• USS May (SP-164) was a yacht during World War I
• USS Osterhaus (DE-164) was a Cannon-class destroyer escort during World War II

In sports

• Baseball Talk was a set of 164 talking baseball cards released by Topps Baseball Card Company in 1989

In transportation

• Caproni Ca.164 was a training biplane produced in Italy prior to World War II
• The Alfa Romeo 164 car produced from 1988 to 1997
• The Volvo 164 car produced from 1968 to 1975
• List of highways numbered 164
• Is a London Transport bus route running between Sutton and Wimbledon

In other fields

164 is also:

• The year AD 164 or 164 BC
• 164 AH is a year in the Islamic calendar that corresponds to 780 – 781 CE
• The Scrabble board, a 15-by-15 grid, includes 164 squares that have neither word nor letter multiplier. The remainder have attributes such as double letter, triple letter, double word, and triple word
• The atomic number of an element temporarily called Unhexquadium
• Solvent Red 164 is a synthetic red diazo dye
• E.164 is an ITU-T recommendation defines public telecommunication numbering plan used in the PSTN and data networks