856681677701 has 2 divisors, whose sum is σ = 856681677702. Its totient is φ = 856681677700.

The previous prime is 856681677653. The next prime is 856681677763. The reversal of 856681677701 is 107776186658.

It is an a-pointer prime, because the next prime (856681677763) can be obtained adding 856681677701 to its sum of digits (62).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 836262696676 + 20418981025 = 914474^2 + 142895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856681677701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856681677101) 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, 428340838850 + 428340838851.

It is an arithmetic number, because the mean of its divisors is an integer number (428340838851).

Almost surely, 2^856681677701 is an apocalyptic number.

It is an amenable number.

856681677701 is a deficient number, since it is larger than the sum of its proper divisors (1).

856681677701 is an equidigital number, since it uses as much as digits as its factorization.

856681677701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23708160, while the sum is 62.

The spelling of 856681677701 in words is "eight hundred fifty-six billion, six hundred eighty-one million, six hundred seventy-seven thousand, seven hundred one".