165045889 has 4 divisors (see below), whose sum is σ = 165182724. Its totient is φ = 164909056.

The previous prime is 165045871. The next prime is 165045899. The reversal of 165045889 is 988540561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48233025 + 116812864 = 6945^2 + 10808^2 .

It is a cyclic number.

It is not a de Polignac number, because 165045889 - 2¹¹ = 165043841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165045899) 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 3 ways as a sum of consecutive naturals, for example, 66592 + ... + 69025.

It is an arithmetic number, because the mean of its divisors is an integer number (41295681).

Almost surely, 2^165045889 is an apocalyptic number.

It is an amenable number.

165045889 is a deficient number, since it is larger than the sum of its proper divisors (136835).

165045889 is a wasteful number, since it uses less digits than its factorization.

165045889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136834.

The product of its (nonzero) digits is 345600, while the sum is 46.

The square root of 165045889 is about 12847.0186813906. The cubic root of 165045889 is about 548.5314974571.

The spelling of 165045889 in words is "one hundred sixty-five million, forty-five thousand, eight hundred eighty-nine".