15987994560 has 336 divisors, whose sum is σ = 57241147392. Its totient is φ = 4091443200.

The previous prime is 15987994549. The next prime is 15987994579. The reversal of 15987994560 is 6549978951.

15987994560 is a `hidden beast` number, since 1 + 5 + 98 + 7 + 99 + 456 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11694997 + ... + 11696363.

Almost surely, 2^15987994560 is an apocalyptic number.

15987994560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15987994560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28620573696).

15987994560 is an abundant number, since it is smaller than the sum of its proper divisors (41253152832).

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

15987994560 is a wasteful number, since it uses less digits than its factorization.

15987994560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552 (or 1539 counting only the distinct ones).

The product of its (nonzero) digits is 24494400, while the sum is 63.

The spelling of 15987994560 in words is "fifteen billion, nine hundred eighty-seven million, nine hundred ninety-four thousand, five hundred sixty".