56616450217 has 2 divisors, whose sum is σ = 56616450218. Its totient is φ = 56616450216.

The previous prime is 56616450199. The next prime is 56616450251. The reversal of 56616450217 is 71205461665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56344991641 + 271458576 = 237371^2 + 16476^2 .

It is a cyclic number.

It is not a de Polignac number, because 56616450217 - 2¹⁹ = 56615925929 is a prime.

It is not a weakly prime, because it can be changed into another prime (56616450017) 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 as a sum of consecutive naturals, namely, 28308225108 + 28308225109.

It is an arithmetic number, because the mean of its divisors is an integer number (28308225109).

Almost surely, 2^56616450217 is an apocalyptic number.

It is an amenable number.

56616450217 is a deficient number, since it is larger than the sum of its proper divisors (1).

56616450217 is an equidigital number, since it uses as much as digits as its factorization.

56616450217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 56616450217 in words is "fifty-six billion, six hundred sixteen million, four hundred fifty thousand, two hundred seventeen".