165989885 has 16 divisors (see below), whose sum is σ = 201462336. Its totient is φ = 131284608.

The previous prime is 165989869. The next prime is 165989893. The reversal of 165989885 is 588989561.

It is a cyclic number.

It is not a de Polignac number, because 165989885 - 2⁴ = 165989869 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303182 + ... + 303728.

It is an arithmetic number, because the mean of its divisors is an integer number (12591396).

Almost surely, 2^165989885 is an apocalyptic number.

It is an amenable number.

165989885 is a deficient number, since it is larger than the sum of its proper divisors (35472451).

165989885 is a wasteful number, since it uses less digits than its factorization.

165989885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132.

The product of its digits is 6220800, while the sum is 59.

The square root of 165989885 is about 12883.7061826169. The cubic root of 165989885 is about 549.5753029974.

The spelling of 165989885 in words is "one hundred sixty-five million, nine hundred eighty-nine thousand, eight hundred eighty-five".