56556538511 has 4 divisors (see below), whose sum is σ = 61698042024. Its totient is φ = 51415035000.

The previous prime is 56556538501. The next prime is 56556538517. The reversal of 56556538511 is 11583565565.

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

It is a cyclic number.

It is not a de Polignac number, because 56556538511 - 2¹⁰ = 56556537487 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 56556538511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56556538517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2570751740 + ... + 2570751761.

It is an arithmetic number, because the mean of its divisors is an integer number (15424510506).

Almost surely, 2^56556538511 is an apocalyptic number.

56556538511 is a deficient number, since it is larger than the sum of its proper divisors (5141503513).

56556538511 is a wasteful number, since it uses less digits than its factorization.

56556538511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5141503512.

The product of its digits is 2700000, while the sum is 50.

The spelling of 56556538511 in words is "fifty-six billion, five hundred fifty-six million, five hundred thirty-eight thousand, five hundred eleven".