56856480221 has 2 divisors, whose sum is σ = 56856480222. Its totient is φ = 56856480220.

The previous prime is 56856480209. The next prime is 56856480253. The reversal of 56856480221 is 12208465865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54260577721 + 2595902500 = 232939^2 + 50950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56856480221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56856480721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28428240110 + 28428240111.

It is an arithmetic number, because the mean of its divisors is an integer number (28428240111).

Almost surely, 2^56856480221 is an apocalyptic number.

It is an amenable number.

56856480221 is a deficient number, since it is larger than the sum of its proper divisors (1).

56856480221 is an equidigital number, since it uses as much as digits as its factorization.

56856480221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 921600, while the sum is 47.

The spelling of 56856480221 in words is "fifty-six billion, eight hundred fifty-six million, four hundred eighty thousand, two hundred twenty-one".