165990423 has 16 divisors (see below), whose sum is σ = 228447360. Its totient is φ = 107153376.

The previous prime is 165990401. The next prime is 165990443. The reversal of 165990423 is 324099561.

It is not a de Polignac number, because 165990423 - 2⁶ = 165990359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165990443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4861 + ... + 18857.

It is an arithmetic number, because the mean of its divisors is an integer number (14277960).

Almost surely, 2^165990423 is an apocalyptic number.

165990423 is a deficient number, since it is larger than the sum of its proper divisors (62456937).

165990423 is a wasteful number, since it uses less digits than its factorization.

165990423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14126.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 165990423 is about 12883.7270616852. The cubic root of 165990423 is about 549.5758967509.

The spelling of 165990423 in words is "one hundred sixty-five million, nine hundred ninety thousand, four hundred twenty-three".