165659323 has 4 divisors (see below), whose sum is σ = 170136640. Its totient is φ = 161182008.

The previous prime is 165659321. The next prime is 165659327. The reversal of 165659323 is 323956561.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 165659323 - 2¹ = 165659321 is a prime.

It is a super-2 number, since 2×165659323² = 54886022593636658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165659321) 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, 2238603 + ... + 2238676.

It is an arithmetic number, because the mean of its divisors is an integer number (42534160).

Almost surely, 2^165659323 is an apocalyptic number.

165659323 is a deficient number, since it is larger than the sum of its proper divisors (4477317).

165659323 is an equidigital number, since it uses as much as digits as its factorization.

165659323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4477316.

The product of its digits is 145800, while the sum is 40.

The square root of 165659323 is about 12870.8711049408. The cubic root of 165659323 is about 549.2102417164.

The spelling of 165659323 in words is "one hundred sixty-five million, six hundred fifty-nine thousand, three hundred twenty-three".