165305885 has 4 divisors (see below), whose sum is σ = 198367068. Its totient is φ = 132244704.

The previous prime is 165305849. The next prime is 165305911. The reversal of 165305885 is 588503561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55517401 + 109788484 = 7451^2 + 10478^2 .

It is a cyclic number.

It is not a de Polignac number, because 165305885 - 2²⁰ = 164257309 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 16530584 + ... + 16530593.

It is an arithmetic number, because the mean of its divisors is an integer number (49591767).

Almost surely, 2^165305885 is an apocalyptic number.

It is an amenable number.

165305885 is a deficient number, since it is larger than the sum of its proper divisors (33061183).

165305885 is an equidigital number, since it uses as much as digits as its factorization.

165305885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33061182.

The product of its (nonzero) digits is 144000, while the sum is 41.

The square root of 165305885 is about 12857.1336230126. The cubic root of 165305885 is about 548.8193793589.

The spelling of 165305885 in words is "one hundred sixty-five million, three hundred five thousand, eight hundred eighty-five".