165918218 has 4 divisors (see below), whose sum is σ = 248877330. Its totient is φ = 82959108.

The previous prime is 165918211. The next prime is 165918223. The reversal of 165918218 is 812819561.

165918218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 117657409 + 48260809 = 10847^2 + 6947^2 .

It is not an unprimeable number, because it can be changed into a prime (165918211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41479553 + ... + 41479556.

Almost surely, 2^165918218 is an apocalyptic number.

165918218 is a deficient number, since it is larger than the sum of its proper divisors (82959112).

165918218 is an equidigital number, since it uses as much as digits as its factorization.

165918218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82959111.

The product of its digits is 34560, while the sum is 41.

The square root of 165918218 is about 12880.9245786162. The cubic root of 165918218 is about 549.4961976089.

The spelling of 165918218 in words is "one hundred sixty-five million, nine hundred eighteen thousand, two hundred eighteen".