56561500085 has 4 divisors (see below), whose sum is σ = 67873800108. Its totient is φ = 45249200064.

The previous prime is 56561500081. The next prime is 56561500123. The reversal of 56561500085 is 58000516565.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17177509969 + 39383990116 = 131063^2 + 198454^2 .

It is a cyclic number.

It is not a de Polignac number, because 56561500085 - 2² = 56561500081 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 (56561500081) 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, 5656150004 + ... + 5656150013.

It is an arithmetic number, because the mean of its divisors is an integer number (16968450027).

Almost surely, 2^56561500085 is an apocalyptic number.

It is an amenable number.

56561500085 is a deficient number, since it is larger than the sum of its proper divisors (11312300023).

56561500085 is a wasteful number, since it uses less digits than its factorization.

56561500085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11312300022.

The product of its (nonzero) digits is 180000, while the sum is 41.

The spelling of 56561500085 in words is "fifty-six billion, five hundred sixty-one million, five hundred thousand, eighty-five".