165089985 has 16 divisors (see below), whose sum is σ = 270587520. Its totient is φ = 85900160.

The previous prime is 165089959. The next prime is 165089989. The reversal of 165089985 is 589980561.

It is not a de Polignac number, because 165089985 - 2⁹ = 165089473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165089989) by changing a digit.

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, 133605 + ... + 134834.

It is an arithmetic number, because the mean of its divisors is an integer number (16911720).

Almost surely, 2^165089985 is an apocalyptic number.

165089985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165089985 is a deficient number, since it is larger than the sum of its proper divisors (105497535).

165089985 is a wasteful number, since it uses less digits than its factorization.

165089985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268488.

The product of its (nonzero) digits is 777600, while the sum is 51.

The square root of 165089985 is about 12848.7347626138. The cubic root of 165089985 is about 548.5803442581.

The spelling of 165089985 in words is "one hundred sixty-five million, eighty-nine thousand, nine hundred eighty-five".