165028865 has 4 divisors (see below), whose sum is σ = 198034644. Its totient is φ = 132023088.

The previous prime is 165028819. The next prime is 165028907. The reversal of 165028865 is 568820561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568820561 = 17 ⋅33460033.

It can be written as a sum of positive squares in 2 ways, for example, as 118352641 + 46676224 = 10879^2 + 6832^2 .

It is a cyclic number.

It is not a de Polignac number, because 165028865 - 2¹⁶ = 164963329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16502882 + ... + 16502891.

It is an arithmetic number, because the mean of its divisors is an integer number (49508661).

Almost surely, 2^165028865 is an apocalyptic number.

It is an amenable number.

165028865 is a deficient number, since it is larger than the sum of its proper divisors (33005779).

165028865 is an equidigital number, since it uses as much as digits as its factorization.

165028865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33005778.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 165028865 is about 12846.3560981315. The cubic root of 165028865 is about 548.5126370028.

The spelling of 165028865 in words is "one hundred sixty-five million, twenty-eight thousand, eight hundred sixty-five".