56581881806 has 16 divisors (see below), whose sum is σ = 84997203984. Its totient is φ = 28249513344.

The previous prime is 56581881781. The next prime is 56581881821. The reversal of 56581881806 is 60818818565.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4177361 + ... + 4190883.

It is an arithmetic number, because the mean of its divisors is an integer number (5312325249).

Almost surely, 2^56581881806 is an apocalyptic number.

56581881806 is a deficient number, since it is larger than the sum of its proper divisors (28415322178).

56581881806 is a wasteful number, since it uses less digits than its factorization.

56581881806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16435.

The product of its (nonzero) digits is 3686400, while the sum is 56.

The spelling of 56581881806 in words is "fifty-six billion, five hundred eighty-one million, eight hundred eighty-one thousand, eight hundred six".