15993649156 has 27 divisors (see below), whose sum is σ = 28782628959. Its totient is φ = 7776141408.

The previous prime is 15993649051. The next prime is 15993649163. The reversal of 15993649156 is 65194639951.

It is a happy number.

The square root of 15993649156 is 126466.

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

It can be written as a sum of positive squares in 4 ways, for example, as 222308100 + 15771341056 = 14910^2 + 125584^2 .

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 15993649156.

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, 9357630 + ... + 9359338.

Almost surely, 2^15993649156 is an apocalyptic number.

15993649156 is the 126466-th square number.

It is an amenable number.

15993649156 is a deficient number, since it is larger than the sum of its proper divisors (12788979803).

15993649156 is an frugal number, since it uses more digits than its factorization.

15993649156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3496 (or 1748 counting only the distinct ones).

The product of its digits is 7873200, while the sum is 58.

The spelling of 15993649156 in words is "fifteen billion, nine hundred ninety-three million, six hundred forty-nine thousand, one hundred fifty-six".