15990505023 has 4 divisors (see below), whose sum is σ = 21320673368. Its totient is φ = 10660336680.

The previous prime is 15990505001. The next prime is 15990505039. The reversal of 15990505023 is 32050509951.

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

It is not a de Polignac number, because 15990505023 - 2¹² = 15990500927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15990505423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2665084168 + ... + 2665084173.

It is an arithmetic number, because the mean of its divisors is an integer number (5330168342).

Almost surely, 2^15990505023 is an apocalyptic number.

15990505023 is a deficient number, since it is larger than the sum of its proper divisors (5330168345).

15990505023 is an equidigital number, since it uses as much as digits as its factorization.

15990505023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330168344.

The product of its (nonzero) digits is 60750, while the sum is 39.

The spelling of 15990505023 in words is "fifteen billion, nine hundred ninety million, five hundred five thousand, twenty-three".