165805923 has 4 divisors (see below), whose sum is σ = 221074568. Its totient is φ = 110537280.

The previous prime is 165805907. The next prime is 165805931. The reversal of 165805923 is 329508561.

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

It is not a de Polignac number, because 165805923 - 2⁴ = 165805907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165805903) 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, 27634318 + ... + 27634323.

It is an arithmetic number, because the mean of its divisors is an integer number (55268642).

Almost surely, 2^165805923 is an apocalyptic number.

165805923 is a deficient number, since it is larger than the sum of its proper divisors (55268645).

165805923 is an equidigital number, since it uses as much as digits as its factorization.

165805923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55268644.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 165805923 is about 12876.5648757734. The cubic root of 165805923 is about 549.3722015774.

The spelling of 165805923 in words is "one hundred sixty-five million, eight hundred five thousand, nine hundred twenty-three".