165315331723 has 4 divisors (see below), whose sum is σ = 165316146688. Its totient is φ = 165314516760.

The previous prime is 165315331721. The next prime is 165315331729. The reversal of 165315331723 is 327133513561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 327133513561 = 6197 ⋅52789013.

It is a cyclic number.

It is not a de Polignac number, because 165315331723 - 2¹ = 165315331721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165315331721) 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, 163318 + ... + 597748.

It is an arithmetic number, because the mean of its divisors is an integer number (41329036672).

Almost surely, 2^165315331723 is an apocalyptic number.

165315331723 is a deficient number, since it is larger than the sum of its proper divisors (814965).

165315331723 is an equidigital number, since it uses as much as digits as its factorization.

165315331723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814964.

The product of its digits is 170100, while the sum is 40.

The spelling of 165315331723 in words is "one hundred sixty-five billion, three hundred fifteen million, three hundred thirty-one thousand, seven hundred twenty-three".