56671722081 has 12 divisors (see below), whose sum is σ = 88156012308. Its totient is φ = 34874905824.

The previous prime is 56671722067. The next prime is 56671722083. The reversal of 56671722081 is 18022717665.

56671722081 is a `hidden beast` number, since 566 + 7 + 1 + 7 + 2 + 2 + 0 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10177581456 + 46494140625 = 100884^2 + 215625^2 .

It is not a de Polignac number, because 56671722081 - 2⁵ = 56671722049 is a prime.

It is a super-2 number, since 2×56671722081² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56671722083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 242186730 + ... + 242186963.

It is an arithmetic number, because the mean of its divisors is an integer number (7346334359).

Almost surely, 2^56671722081 is an apocalyptic number.

It is an amenable number.

56671722081 is a deficient number, since it is larger than the sum of its proper divisors (31484290227).

56671722081 is a wasteful number, since it uses less digits than its factorization.

56671722081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484373712 (or 484373709 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 56671722081 in words is "fifty-six billion, six hundred seventy-one million, seven hundred twenty-two thousand, eighty-one".