165331565 has 8 divisors (see below), whose sum is σ = 226740480. Its totient is φ = 113370192.

The previous prime is 165331547. The next prime is 165331589. The reversal of 165331565 is 565133561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165331565 - 2⁶ = 165331501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 4723759 = 165331565 / (1 + 6 + 5 + 3 + 3 + 1 + 5 + 6 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2361845 + ... + 2361914.

It is an arithmetic number, because the mean of its divisors is an integer number (28342560).

Almost surely, 2^165331565 is an apocalyptic number.

It is an amenable number.

165331565 is a deficient number, since it is larger than the sum of its proper divisors (61408915).

165331565 is an equidigital number, since it uses as much as digits as its factorization.

165331565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4723771.

The product of its digits is 40500, while the sum is 35.

The square root of 165331565 is about 12858.1322516142. The cubic root of 165331565 is about 548.8477972863.

The spelling of 165331565 in words is "one hundred sixty-five million, three hundred thirty-one thousand, five hundred sixty-five".