165138508 has 6 divisors (see below), whose sum is σ = 288992396. Its totient is φ = 82569252.

The previous prime is 165138503. The next prime is 165138559. The reversal of 165138508 is 805831561.

165138508 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (165138503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20642310 + ... + 20642317.

Almost surely, 2^165138508 is an apocalyptic number.

It is an amenable number.

165138508 is a deficient number, since it is larger than the sum of its proper divisors (123853888).

165138508 is a wasteful number, since it uses less digits than its factorization.

165138508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41284631 (or 41284629 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 165138508 is about 12850.6228642817. The cubic root of 165138508 is about 548.6340849631.

The spelling of 165138508 in words is "one hundred sixty-five million, one hundred thirty-eight thousand, five hundred eight".