15789799856 has 20 divisors (see below), whose sum is σ = 31169960352. Its totient is φ = 7745939136.

The previous prime is 15789799849. The next prime is 15789799871. The reversal of 15789799856 is 65899798751.

It is a happy number.

15789799856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9309176 + ... + 9310871.

Almost surely, 2^15789799856 is an apocalyptic number.

15789799856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15789799856 is a deficient number, since it is larger than the sum of its proper divisors (15380160496).

15789799856 is a wasteful number, since it uses less digits than its factorization.

15789799856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18620108 (or 18620102 counting only the distinct ones).

The product of its digits is 342921600, while the sum is 74.

The spelling of 15789799856 in words is "fifteen billion, seven hundred eighty-nine million, seven hundred ninety-nine thousand, eight hundred fifty-six".