856788611017 has 2 divisors, whose sum is σ = 856788611018. Its totient is φ = 856788611016.

The previous prime is 856788610991. The next prime is 856788611033. The reversal of 856788611017 is 710116887658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 663664398336 + 193124212681 = 814656^2 + 439459^2 .

It is a cyclic number.

It is not a de Polignac number, because 856788611017 - 2¹⁹ = 856788086729 is a prime.

It is not a weakly prime, because it can be changed into another prime (856788671017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428394305508 + 428394305509.

It is an arithmetic number, because the mean of its divisors is an integer number (428394305509).

Almost surely, 2^856788611017 is an apocalyptic number.

It is an amenable number.

856788611017 is a deficient number, since it is larger than the sum of its proper divisors (1).

856788611017 is an equidigital number, since it uses as much as digits as its factorization.

856788611017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4515840, while the sum is 58.

The spelling of 856788611017 in words is "eight hundred fifty-six billion, seven hundred eighty-eight million, six hundred eleven thousand, seventeen".