165051218 has 4 divisors (see below), whose sum is σ = 247576830. Its totient is φ = 82525608.

The previous prime is 165051193. The next prime is 165051247. The reversal of 165051218 is 812150561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812150561 = 229 ⋅3546509.

It can be written as a sum of positive squares in only one way, i.e., 126945289 + 38105929 = 11267^2 + 6173^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41262803 + ... + 41262806.

Almost surely, 2^165051218 is an apocalyptic number.

165051218 is a deficient number, since it is larger than the sum of its proper divisors (82525612).

165051218 is an equidigital number, since it uses as much as digits as its factorization.

165051218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82525611.

The product of its (nonzero) digits is 2400, while the sum is 29.

The square root of 165051218 is about 12847.2260819213. The cubic root of 165051218 is about 548.5374010534.

The spelling of 165051218 in words is "one hundred sixty-five million, fifty-one thousand, two hundred eighteen".