165604885 has 8 divisors (see below), whose sum is σ = 198799416. Its totient is φ = 132434880.

The previous prime is 165604867. The next prime is 165604891. The reversal of 165604885 is 588406561.

It can be written as a sum of positive squares in 4 ways, for example, as 2353156 + 163251729 = 1534^2 + 12777^2 .

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

It is not a de Polignac number, because 165604885 - 2⁷ = 165604757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15987 + ... + 24223.

It is an arithmetic number, because the mean of its divisors is an integer number (24849927).

Almost surely, 2^165604885 is an apocalyptic number.

It is an amenable number.

165604885 is a deficient number, since it is larger than the sum of its proper divisors (33194531).

165604885 is an equidigital number, since it uses as much as digits as its factorization.

165604885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12263.

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 165604885 is about 12868.7561558995. The cubic root of 165604885 is about 549.1500757039.

The spelling of 165604885 in words is "one hundred sixty-five million, six hundred four thousand, eight hundred eighty-five".