15956328641 has 16 divisors (see below), whose sum is σ = 18148976640. Its totient is φ = 13895239680.

The previous prime is 15956328631. The next prime is 15956328659. The reversal of 15956328641 is 14682365951.

It is a cyclic number.

It is not a de Polignac number, because 15956328641 - 2¹⁴ = 15956312257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15956328641.

It is not an unprimeable number, because it can be changed into a prime (15956328631) 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, 156416 + ... + 237441.

It is an arithmetic number, because the mean of its divisors is an integer number (1134311040).

Almost surely, 2^15956328641 is an apocalyptic number.

15956328641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15956328641 is a deficient number, since it is larger than the sum of its proper divisors (2192647999).

15956328641 is a wasteful number, since it uses less digits than its factorization.

15956328641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394024.

The product of its digits is 1555200, while the sum is 50.

The spelling of 15956328641 in words is "fifteen billion, nine hundred fifty-six million, three hundred twenty-eight thousand, six hundred forty-one".