165506918 has 16 divisors (see below), whose sum is σ = 253175760. Its totient is φ = 81122976.

The previous prime is 165506911. The next prime is 165506921. The reversal of 165506918 is 819605561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165506911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45080 + ... + 48612.

It is an arithmetic number, because the mean of its divisors is an integer number (15823485).

Almost surely, 2^165506918 is an apocalyptic number.

165506918 is a deficient number, since it is larger than the sum of its proper divisors (87668842).

165506918 is a wasteful number, since it uses less digits than its factorization.

165506918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3991.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 165506918 is about 12864.9492031644. The cubic root of 165506918 is about 549.0417673097.

The spelling of 165506918 in words is "one hundred sixty-five million, five hundred six thousand, nine hundred eighteen".