165045987 has 12 divisors (see below), whose sum is σ = 238576104. Its totient is φ = 109949280.

The previous prime is 165045949. The next prime is 165046003. The reversal of 165045987 is 789540561.

165045987 is a `hidden beast` number, since 1 + 6 + 50 + 4 + 598 + 7 = 666.

It is not a de Polignac number, because 165045987 - 2¹⁶ = 164980451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165045917) 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, 7687 + ... + 19727.

It is an arithmetic number, because the mean of its divisors is an integer number (19881342).

Almost surely, 2^165045987 is an apocalyptic number.

165045987 is a deficient number, since it is larger than the sum of its proper divisors (73530117).

165045987 is a wasteful number, since it uses less digits than its factorization.

165045987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13570 (or 13567 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 165045987 is about 12847.0224955046. The cubic root of 165045987 is about 548.5316060250.

The spelling of 165045987 in words is "one hundred sixty-five million, forty-five thousand, nine hundred eighty-seven".