856782641889 has 12 divisors (see below), whose sum is σ = 1246608322596. Its totient is φ = 567019168512.

The previous prime is 856782641857. The next prime is 856782641893. The reversal of 856782641889 is 988146287658.

856782641889 is a `hidden beast` number, since 8 + 56 + 7 + 82 + 6 + 418 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 719456811264 + 137325830625 = 848208^2 + 370575^2 .

It is not a de Polignac number, because 856782641889 - 2⁵ = 856782641857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (856782641809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 347436984 + ... + 347439449.

It is an arithmetic number, because the mean of its divisors is an integer number (103884026883).

Almost surely, 2^856782641889 is an apocalyptic number.

It is an amenable number.

856782641889 is a deficient number, since it is larger than the sum of its proper divisors (389825680707).

856782641889 is a wasteful number, since it uses less digits than its factorization.

856782641889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694876576 (or 694876573 counting only the distinct ones).

The product of its digits is 371589120, while the sum is 72.

The spelling of 856782641889 in words is "eight hundred fifty-six billion, seven hundred eighty-two million, six hundred forty-one thousand, eight hundred eighty-nine".