165178138 has 16 divisors (see below), whose sum is σ = 254807784. Its totient is φ = 80248320.

The previous prime is 165178133. The next prime is 165178141. The reversal of 165178138 is 831871561.

165178138 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 4 ways, for example, as 148425489 + 16752649 = 12183^2 + 4093^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 165178138.

It is not an unprimeable number, because it can be changed into a prime (165178133) 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, 95118 + ... + 96838.

Almost surely, 2^165178138 is an apocalyptic number.

165178138 is a deficient number, since it is larger than the sum of its proper divisors (89629646).

165178138 is a wasteful number, since it uses less digits than its factorization.

165178138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057.

The product of its digits is 40320, while the sum is 40.

The square root of 165178138 is about 12852.1647203885. The cubic root of 165178138 is about 548.6779685895.

The spelling of 165178138 in words is "one hundred sixty-five million, one hundred seventy-eight thousand, one hundred thirty-eight".