15991774216 has 64 divisors (see below), whose sum is σ = 32942246400. Its totient is φ = 7217664000.

The previous prime is 15991774187. The next prime is 15991774219. The reversal of 15991774216 is 61247719951.

It is not an unprimeable number, because it can be changed into a prime (15991774219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9987816 + ... + 9989416.

It is an arithmetic number, because the mean of its divisors is an integer number (514722600).

Almost surely, 2^15991774216 is an apocalyptic number.

It is an amenable number.

15991774216 is an abundant number, since it is smaller than the sum of its proper divisors (16950472184).

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

15991774216 is a wasteful number, since it uses less digits than its factorization.

15991774216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2350 (or 2346 counting only the distinct ones).

The product of its digits is 952560, while the sum is 52.

The spelling of 15991774216 in words is "fifteen billion, nine hundred ninety-one million, seven hundred seventy-four thousand, two hundred sixteen".