56561355887 has 4 divisors (see below), whose sum is σ = 56652731880. Its totient is φ = 56469979896.

The previous prime is 56561355883. The next prime is 56561355913. The reversal of 56561355887 is 78855316565.

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 56561355887 - 2² = 56561355883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56561355883) 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, 45687068 + ... + 45688305.

It is an arithmetic number, because the mean of its divisors is an integer number (14163182970).

Almost surely, 2^56561355887 is an apocalyptic number.

56561355887 is a deficient number, since it is larger than the sum of its proper divisors (91375993).

56561355887 is an equidigital number, since it uses as much as digits as its factorization.

56561355887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91375992.

The product of its digits is 30240000, while the sum is 59.

The spelling of 56561355887 in words is "fifty-six billion, five hundred sixty-one million, three hundred fifty-five thousand, eight hundred eighty-seven".