56561371636 has 48 divisors (see below), whose sum is σ = 130665854592. Its totient is φ = 20740608000.

The previous prime is 56561371631. The next prime is 56561371639. The reversal of 56561371636 is 63617316565.

It is a happy number.

It is a super-2 number, since 2×56561371636² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56561371636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56561371631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5395965 + ... + 5406436.

It is an arithmetic number, because the mean of its divisors is an integer number (2722205304).

Almost surely, 2^56561371636 is an apocalyptic number.

It is an amenable number.

56561371636 is an abundant number, since it is smaller than the sum of its proper divisors (74104482956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56561371636 is a wasteful number, since it uses less digits than its factorization.

56561371636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10802440 (or 10802438 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 49.

The spelling of 56561371636 in words is "fifty-six billion, five hundred sixty-one million, three hundred seventy-one thousand, six hundred thirty-six".