165145977 has 12 divisors (see below), whose sum is σ = 240861504. Its totient is φ = 109027800.

The previous prime is 165145969. The next prime is 165146017. The reversal of 165145977 is 779541561.

165145977 is a `hidden beast` number, since 1 + 6 + 51 + 4 + 597 + 7 = 666.

It is not a de Polignac number, because 165145977 - 2³ = 165145969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165145927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88149 + ... + 90002.

It is an arithmetic number, because the mean of its divisors is an integer number (20071792).

Almost surely, 2^165145977 is an apocalyptic number.

It is an amenable number.

165145977 is a deficient number, since it is larger than the sum of its proper divisors (75715527).

165145977 is a wasteful number, since it uses less digits than its factorization.

165145977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178260 (or 178257 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 165145977 is about 12850.9134694776. The cubic root of 165145977 is about 548.6423561738.

The spelling of 165145977 in words is "one hundred sixty-five million, one hundred forty-five thousand, nine hundred seventy-seven".