165309324289 has 4 divisors (see below), whose sum is σ = 165640606000. Its totient is φ = 164978042580.

The previous prime is 165309324203. The next prime is 165309324329. The reversal of 165309324289 is 982423903561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165309324289 - 2²⁷ = 165175106561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165309327289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165640107 + ... + 165641104.

It is an arithmetic number, because the mean of its divisors is an integer number (41410151500).

Almost surely, 2^165309324289 is an apocalyptic number.

It is an amenable number.

165309324289 is a deficient number, since it is larger than the sum of its proper divisors (331281711).

165309324289 is an equidigital number, since it uses as much as digits as its factorization.

165309324289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331281710.

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 165309324289 in words is "one hundred sixty-five billion, three hundred nine million, three hundred twenty-four thousand, two hundred eighty-nine".