165870089 has 32 divisors (see below), whose sum is σ = 218916864. Its totient is φ = 121841280.

The previous prime is 165870083. The next prime is 165870109. The reversal of 165870089 is 980078561.

It is a happy number.

165870089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165870089 - 2⁴ = 165870073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165870083) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128642 + ... + 129924.

It is an arithmetic number, because the mean of its divisors is an integer number (6841152).

Almost surely, 2^165870089 is an apocalyptic number.

It is an amenable number.

165870089 is a deficient number, since it is larger than the sum of its proper divisors (53046775).

165870089 is a wasteful number, since it uses less digits than its factorization.

165870089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 165870089 is about 12879.0562154220. The cubic root of 165870089 is about 549.4430604662.

The spelling of 165870089 in words is "one hundred sixty-five million, eight hundred seventy thousand, eighty-nine".