856685862701 has 2 divisors, whose sum is σ = 856685862702. Its totient is φ = 856685862700.

The previous prime is 856685862679. The next prime is 856685862709. The reversal of 856685862701 is 107268586658.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 856502124676 + 183738025 = 925474^2 + 13555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856685862701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856685862709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428342931350 + 428342931351.

It is an arithmetic number, because the mean of its divisors is an integer number (428342931351).

Almost surely, 2^856685862701 is an apocalyptic number.

It is an amenable number.

856685862701 is a deficient number, since it is larger than the sum of its proper divisors (1).

856685862701 is an equidigital number, since it uses as much as digits as its factorization.

856685862701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38707200, while the sum is 62.

The spelling of 856685862701 in words is "eight hundred fifty-six billion, six hundred eighty-five million, eight hundred sixty-two thousand, seven hundred one".