150 (one hundred [and] fifty) is the natural number following 149 and preceding 151.
In mathematics 150 is the sum of eight consecutive primes (7 + 11 + 13 + 17 + 19 + 23 + 29 + 31). Given 150, the Mertens function returns 0. 150 is conjectured to be the only minimal difference greater than 1 of any increasing arithmetic progression of n primes (in this case, n = 7) that is not a primorial (a product of the first m primes). The sum of Euler's totient function φ(x) over the first twenty-two integers is 150. 150 is a Harshad number and an abundant number. 150 degrees is the measure of the internal angle of a regular dodecagon. is the largest known generalized Fermat prime with even base less than 1000.
In other fields 150 is also: The number of degrees in the quincunx astrological aspect explored by Johannes Kepler. The approximate value for Dunbar's number, a theoretical value with implications in sociology and anthropology. It is actually 148.
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