165017138 has 24 divisors (see below), whose sum is σ = 293008044. Its totient is φ = 69236640.

The previous prime is 165017137. The next prime is 165017161. The reversal of 165017138 is 831710561.

It can be written as a sum of positive squares in 2 ways, for example, as 155326369 + 9690769 = 12463^2 + 3113^2 .

It is a super-2 number, since 2×165017138² = 54461311667422088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165017131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23081 + ... + 29372.

Almost surely, 2^165017138 is an apocalyptic number.

165017138 is a deficient number, since it is larger than the sum of its proper divisors (127990906).

165017138 is a wasteful number, since it uses less digits than its factorization.

165017138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52490 (or 52479 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 165017138 is about 12845.8996570890. The cubic root of 165017138 is about 548.4996442050.

Adding to 165017138 its reverse (831710561), we get a palindrome (996727699).

The spelling of 165017138 in words is "one hundred sixty-five million, seventeen thousand, one hundred thirty-eight".