856681677723 has 4 divisors (see below), whose sum is σ = 1142242236968. Its totient is φ = 571121118480.

The previous prime is 856681677701. The next prime is 856681677763. The reversal of 856681677723 is 327776186658.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 856681677723 - 2²¹ = 856679580571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856681677763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142780279618 + ... + 142780279623.

It is an arithmetic number, because the mean of its divisors is an integer number (285560559242).

Almost surely, 2^856681677723 is an apocalyptic number.

856681677723 is a deficient number, since it is larger than the sum of its proper divisors (285560559245).

856681677723 is a wasteful number, since it uses less digits than its factorization.

856681677723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285560559244.

The product of its digits is 142248960, while the sum is 66.

The spelling of 856681677723 in words is "eight hundred fifty-six billion, six hundred eighty-one million, six hundred seventy-seven thousand, seven hundred twenty-three".