165185985 has 16 divisors (see below), whose sum is σ = 264996864. Its totient is φ = 87866112.

The previous prime is 165185983. The next prime is 165186031. The reversal of 165185985 is 589581561.

It is not a de Polignac number, because 165185985 - 2¹ = 165185983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165185983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8632 + ... + 20121.

It is an arithmetic number, because the mean of its divisors is an integer number (16562304).

Almost surely, 2^165185985 is an apocalyptic number.

165185985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165185985 is a deficient number, since it is larger than the sum of its proper divisors (99810879).

165185985 is a wasteful number, since it uses less digits than its factorization.

165185985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29144.

The product of its digits is 432000, while the sum is 48.

The square root of 165185985 is about 12852.4699960747. The cubic root of 165185985 is about 548.6866570029.

The spelling of 165185985 in words is "one hundred sixty-five million, one hundred eighty-five thousand, nine hundred eighty-five".