16165985 has 16 divisors (see below), whose sum is σ = 21297600. Its totient is φ = 11682240.

The previous prime is 16165969. The next prime is 16165991. The reversal of 16165985 is 58956161.

It is not a de Polignac number, because 16165985 - 2⁴ = 16165969 is a prime.

It is a super-2 number, since 2×16165985² = 522678142040450, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 8666 + ... + 10364.

It is an arithmetic number, because the mean of its divisors is an integer number (1331100).

Almost surely, 2^16165985 is an apocalyptic number.

It is an amenable number.

16165985 is a deficient number, since it is larger than the sum of its proper divisors (5131615).

16165985 is a wasteful number, since it uses less digits than its factorization.

16165985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888.

The product of its digits is 64800, while the sum is 41.

The square root of 16165985 is about 4020.6945917341. The cubic root of 16165985 is about 252.8525806697.

The spelling of 16165985 in words is "sixteen million, one hundred sixty-five thousand, nine hundred eighty-five".