56575666881 has 12 divisors (see below), whose sum is σ = 81723278052. Its totient is φ = 37715786496.

The previous prime is 56575666879. The next prime is 56575666907. The reversal of 56575666881 is 18866657565.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 40578476481 + 15997190400 = 201441^2 + 126480^2 .

It is not a de Polignac number, because 56575666881 - 2¹ = 56575666879 is a prime.

It is a super-2 number, since 2×56575666881² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56575666801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 208585 + ... + 395801.

It is an arithmetic number, because the mean of its divisors is an integer number (6810273171).

Almost surely, 2^56575666881 is an apocalyptic number.

It is an amenable number.

56575666881 is a deficient number, since it is larger than the sum of its proper divisors (25147611171).

56575666881 is a wasteful number, since it uses less digits than its factorization.

56575666881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220800 (or 220797 counting only the distinct ones).

The product of its digits is 72576000, while the sum is 63.

The spelling of 56575666881 in words is "fifty-six billion, five hundred seventy-five million, six hundred sixty-six thousand, eight hundred eighty-one".