856191439868 has 12 divisors (see below), whose sum is σ = 1498371727272. Its totient is φ = 428085232080.

The previous prime is 856191439867. The next prime is 856191439889. The reversal of 856191439868 is 868934191658.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 856191439798 and 856191439807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856191439867) 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, 2436830 + ... + 2765957.

It is an arithmetic number, because the mean of its divisors is an integer number (124864310606).

Almost surely, 2^856191439868 is an apocalyptic number.

It is an amenable number.

856191439868 is a deficient number, since it is larger than the sum of its proper divisors (642180287404).

856191439868 is a wasteful number, since it uses less digits than its factorization.

856191439868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5243932 (or 5243930 counting only the distinct ones).

The product of its digits is 89579520, while the sum is 68.

The spelling of 856191439868 in words is "eight hundred fifty-six billion, one hundred ninety-one million, four hundred thirty-nine thousand, eight hundred sixty-eight".