556721721536 has 28 divisors (see below), whose sum is σ = 1104986301072. Its totient is φ = 278299976448.

The previous prime is 556721721529. The next prime is 556721721551. The reversal of 556721721536 is 635127127655.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655715 + ... + 1242338.

Almost surely, 2^556721721536 is an apocalyptic number.

It is an amenable number.

556721721536 is a deficient number, since it is larger than the sum of its proper divisors (548264579536).

556721721536 is a wasteful number, since it uses less digits than its factorization.

556721721536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902648 (or 1902638 counting only the distinct ones).

The product of its digits is 2646000, while the sum is 50.

The spelling of 556721721536 in words is "five hundred fifty-six billion, seven hundred twenty-one million, seven hundred twenty-one thousand, five hundred thirty-six".