15981612324 has 24 divisors (see below), whose sum is σ = 37293721248. Its totient is φ = 5326733760.

The previous prime is 15981612299. The next prime is 15981612337. The reversal of 15981612324 is 42321618951.

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, 99919 + ... + 204809.

It is an arithmetic number, because the mean of its divisors is an integer number (1553905052).

Almost surely, 2^15981612324 is an apocalyptic number.

It is an amenable number.

15981612324 is an abundant number, since it is smaller than the sum of its proper divisors (21312108924).

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

15981612324 is a wasteful number, since it uses less digits than its factorization.

15981612324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117595 (or 117593 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The spelling of 15981612324 in words is "fifteen billion, nine hundred eighty-one million, six hundred twelve thousand, three hundred twenty-four".