165175985 has 8 divisors (see below), whose sum is σ = 213458280. Its totient is φ = 121976064.

The previous prime is 165175979. The next prime is 165175993. The reversal of 165175985 is 589571561.

It can be written as a sum of positive squares in 4 ways, for example, as 6315169 + 158860816 = 2513^2 + 12604^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165175985 - 2¹² = 165171889 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1270520 + ... + 1270649.

It is an arithmetic number, because the mean of its divisors is an integer number (26682285).

Almost surely, 2^165175985 is an apocalyptic number.

It is an amenable number.

165175985 is a deficient number, since it is larger than the sum of its proper divisors (48282295).

165175985 is a wasteful number, since it uses less digits than its factorization.

165175985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2541187.

The product of its digits is 378000, while the sum is 47.

The square root of 165175985 is about 12852.0809599068. The cubic root of 165175985 is about 548.6755846808.

The spelling of 165175985 in words is "one hundred sixty-five million, one hundred seventy-five thousand, nine hundred eighty-five".