15999231456 has 120 divisors (see below), whose sum is σ = 50672886264. Its totient is φ = 4922830080.

The previous prime is 15999231439. The next prime is 15999231461. The reversal of 15999231456 is 65413299951.

15999231456 is a `hidden beast` number, since 1 + 599 + 9 + 2 + 3 + 1 + 45 + 6 = 666.

15999231456 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 203710 + ... + 271101.

Almost surely, 2^15999231456 is an apocalyptic number.

15999231456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15999231456 is an abundant number, since it is smaller than the sum of its proper divisors (34673654808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15999231456 is a wasteful number, since it uses less digits than its factorization.

15999231456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474846 (or 474829 counting only the distinct ones).

The product of its digits is 2624400, while the sum is 54.

The spelling of 15999231456 in words is "fifteen billion, nine hundred ninety-nine million, two hundred thirty-one thousand, four hundred fifty-six".