15985897144 has 32 divisors (see below), whose sum is σ = 34270708320. Its totient is φ = 6848055936.

The previous prime is 15985897129. The next prime is 15985897199. The reversal of 15985897144 is 44179858951.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66162 + ... + 190654.

It is an arithmetic number, because the mean of its divisors is an integer number (1070959635).

Almost surely, 2^15985897144 is an apocalyptic number.

15985897144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

15985897144 is an abundant number, since it is smaller than the sum of its proper divisors (18284811176).

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

15985897144 is a wasteful number, since it uses less digits than its factorization.

15985897144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126799 (or 126795 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 61.

The spelling of 15985897144 in words is "fifteen billion, nine hundred eighty-five million, eight hundred ninety-seven thousand, one hundred forty-four".