56021616538 has 4 divisors (see below), whose sum is σ = 84032424810. Its totient is φ = 28010808268.

The previous prime is 56021616523. The next prime is 56021616593. The reversal of 56021616538 is 83561612065.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 37503033649 + 18518582889 = 193657^2 + 136083^2 .

It is a junction number, because it is equal to n+sod(n) for n = 56021616494 and 56021616503.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14005404133 + ... + 14005404136.

Almost surely, 2^56021616538 is an apocalyptic number.

56021616538 is a deficient number, since it is larger than the sum of its proper divisors (28010808272).

56021616538 is a wasteful number, since it uses less digits than its factorization.

56021616538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28010808271.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 56021616538 in words is "fifty-six billion, twenty-one million, six hundred sixteen thousand, five hundred thirty-eight".