15191398656 has 432 divisors, whose sum is σ = 52293696000. Its totient is φ = 4237664256.

The previous prime is 15191398633. The next prime is 15191398667. The reversal of 15191398656 is 65689319151.

15191398656 is a `hidden beast` number, since 1 + 5 + 191 + 398 + 65 + 6 = 666.

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, 37142580 + ... + 37142988.

Almost surely, 2^15191398656 is an apocalyptic number.

15191398656 is a gapful number since it is divisible by the number (16) 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 15191398656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26146848000).

15191398656 is an abundant number, since it is smaller than the sum of its proper divisors (37102297344).

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

15191398656 is an equidigital number, since it uses as much as digits as its factorization.

15191398656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 468 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 54.

The spelling of 15191398656 in words is "fifteen billion, one hundred ninety-one million, three hundred ninety-eight thousand, six hundred fifty-six".