56812722721866 has 96 divisors (see below), whose sum is σ = 125959621364928. Its totient is φ = 18501684284160.

The previous prime is 56812722721841. The next prime is 56812722721889. The reversal of 56812722721866 is 66812722721865.

56812722721866 is a `hidden beast` number, since 5 + 6 + 81 + 272 + 272 + 18 + 6 + 6 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2155494760 + ... + 2155521116.

It is an arithmetic number, because the mean of its divisors is an integer number (1312079389218).

Almost surely, 2^{56812722721866} is an apocalyptic number.

56812722721866 is an abundant number, since it is smaller than the sum of its proper divisors (69146898643062).

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

56812722721866 is a wasteful number, since it uses less digits than its factorization.

56812722721866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41876 (or 41873 counting only the distinct ones).

The product of its digits is 54190080, while the sum is 63.

Subtracting 56812722721866 from its reverse (66812722721865), we obtain a palindrome (9999999999999).

The spelling of 56812722721866 in words is "fifty-six trillion, eight hundred twelve billion, seven hundred twenty-two million, seven hundred twenty-one thousand, eight hundred sixty-six".