15721648996 has 27 divisors (see below), whose sum is σ = 27937488243. Its totient is φ = 7741331640.

The previous prime is 15721648961. The next prime is 15721649017. The reversal of 15721648996 is 69984612751.

The square root of 15721648996 is 125386.

It is a perfect power (a square), and thus also a powerful number.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

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 15721648996.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17804371 + ... + 17805253.

Almost surely, 2^15721648996 is an apocalyptic number.

15721648996 is the 125386-th square number.

It is an amenable number.

15721648996 is a deficient number, since it is larger than the sum of its proper divisors (12215839247).

15721648996 is an frugal number, since it uses more digits than its factorization.

15721648996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912 (or 956 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 58.

The spelling of 15721648996 in words is "fifteen billion, seven hundred twenty-one million, six hundred forty-eight thousand, nine hundred ninety-six".