56637781885 has 4 divisors (see below), whose sum is σ = 67965338268. Its totient is φ = 45310225504.

The previous prime is 56637781867. The next prime is 56637781919. The reversal of 56637781885 is 58818773665.

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 12629713924 + 44008067961 = 112382^2 + 209781^2 .

It is a cyclic number.

It is not a de Polignac number, because 56637781885 - 2¹¹ = 56637779837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5663778184 + ... + 5663778193.

It is an arithmetic number, because the mean of its divisors is an integer number (16991334567).

Almost surely, 2^56637781885 is an apocalyptic number.

It is an amenable number.

56637781885 is a deficient number, since it is larger than the sum of its proper divisors (11327556383).

56637781885 is a wasteful number, since it uses less digits than its factorization.

56637781885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11327556382.

The product of its digits is 67737600, while the sum is 64.

The spelling of 56637781885 in words is "fifty-six billion, six hundred thirty-seven million, seven hundred eighty-one thousand, eight hundred eighty-five".