165218975 has 12 divisors (see below), whose sum is σ = 205917624. Its totient is φ = 131500320.

The previous prime is 165218957. The next prime is 165218983. The reversal of 165218975 is 579812561.

It is a de Polignac number, because none of the positive numbers 2^k-165218975 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11849 + ... + 21698.

It is an arithmetic number, because the mean of its divisors is an integer number (17159802).

Almost surely, 2^165218975 is an apocalyptic number.

165218975 is a deficient number, since it is larger than the sum of its proper divisors (40698649).

165218975 is a wasteful number, since it uses less digits than its factorization.

165218975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33754 (or 33749 counting only the distinct ones).

The product of its digits is 151200, while the sum is 44.

The square root of 165218975 is about 12853.7533428956. The cubic root of 165218975 is about 548.7231814250.

The spelling of 165218975 in words is "one hundred sixty-five million, two hundred eighteen thousand, nine hundred seventy-five".