165538818 has 12 divisors (see below), whose sum is σ = 358667478. Its totient is φ = 55179600.

The previous prime is 165538817. The next prime is 165538859. The reversal of 165538818 is 818835561.

165538818 is a `hidden beast` number, since 1 + 6 + 553 + 88 + 18 = 666.

165538818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 108430569 + 57108249 = 10413^2 + 7557^2 .

It is not an unprimeable number, because it can be changed into a prime (165538817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4598283 + ... + 4598318.

Almost surely, 2^165538818 is an apocalyptic number.

165538818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

165538818 is an abundant number, since it is smaller than the sum of its proper divisors (193128660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165538818 is a wasteful number, since it uses less digits than its factorization.

165538818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9196609 (or 9196606 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The square root of 165538818 is about 12866.1889462265. The cubic root of 165538818 is about 549.0770393645.

The spelling of 165538818 in words is "one hundred sixty-five million, five hundred thirty-eight thousand, eight hundred eighteen".