167 (one hundred [and] sixty-seven) is the natural number following 166 and preceding 168. In mathematics 167 is an emirp, an isolated prime, a Chen prime, a Gaussian prime, a safe prime, and an Eisenstein prime with no imaginary part and a real part of the form . 167 is the smallest prime which can not be expressed as a sum of seven or fewer cubes. It is also the smallest number which requires six terms when expressed using the greedy algorithm as a sum of squares, 167 = 144 + 16 + 4 + 1 + 1 + 1, although by Lagrange's four-square theorem its non-greedy expression as a sum of squares can be shorter, e.g. 167 = 121 + 36 + 9 + 1. 167 is a full reptend prime in base 10, since the decimal expansion of 1/167 repeats the following 166 digits: 0.00598802395209580838323353293413173652694610778443113772455089820359281437125748502994 0119760479041916167664670658682634730538922155688622754491017964071856287425149700... 167 is a highly cototient number, as it is the smallest number k with exactly 15 solutions to the equation x - φ(x) = k. It is also a strictly non-palindromic number. 167 is the smallest multi-digit prime such that the product of digits is equal to the number of digits times the sum of the digits, i. e., 1×6×7 = 3×(1+6+7) 167 is the smallest positive integer d such that the imaginary quadratic field Q() has class number = 11. In astronomy 167 Urda is a main belt asteroid 167P/CINEOS is a periodic comet in the Solar System IC 167 is interacting galaxies In the military Marine Light Attack Helicopter Squadron 167 is a United States Marine Corps helicopter squadron Martin Model 167 was a U.S.-designed light bomber during World War II was a U.S. Navy Diver-class rescue and salvage ship during World War II was a U.S. Navy during World War II was a U.S. Navy during World War II was a U.S. Navy during World War I was a U.S. Navy during World War II was a transport ship during World War II was a U.S. Navy during World War II In sports Martina Navratilova has 167 tennis titles, an all-time record for men or women In transportation London Buses route 167 167th Street is an elevated local station in the Bronx on the IRT Jerome Avenue Line, , of the New York City Subway. 167th Street is an underground local station in the Bronx on the IND Concourse