856681677653 has 2 divisors, whose sum is σ = 856681677654. Its totient is φ = 856681677652.

The previous prime is 856681677647. The next prime is 856681677701. The reversal of 856681677653 is 356776186658.

856681677653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 435043138084 + 421638539569 = 659578^2 + 649337^2 .

It is a cyclic number.

It is not a de Polignac number, because 856681677653 - 2¹⁰ = 856681676629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856681677353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428340838826 + 428340838827.

It is an arithmetic number, because the mean of its divisors is an integer number (428340838827).

Almost surely, 2^856681677653 is an apocalyptic number.

It is an amenable number.

856681677653 is a deficient number, since it is larger than the sum of its proper divisors (1).

856681677653 is an equidigital number, since it uses as much as digits as its factorization.

856681677653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 304819200, while the sum is 68.

The spelling of 856681677653 in words is "eight hundred fifty-six billion, six hundred eighty-one million, six hundred seventy-seven thousand, six hundred fifty-three".