856378794931 has 8 divisors (see below), whose sum is σ = 934274921328. Its totient is φ = 778489920000.

The previous prime is 856378794923. The next prime is 856378794941. The reversal of 856378794931 is 139497873658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856378794931 - 2³ = 856378794923 is a prime.

It is a super-2 number, since 2×856378794931² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856378794941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1564450 + ... + 2039671.

It is an arithmetic number, because the mean of its divisors is an integer number (116784365166).

Almost surely, 2^856378794931 is an apocalyptic number.

856378794931 is a deficient number, since it is larger than the sum of its proper divisors (77896126397).

856378794931 is a wasteful number, since it uses less digits than its factorization.

856378794931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3625733.

The product of its digits is 274337280, while the sum is 70.

The spelling of 856378794931 in words is "eight hundred fifty-six billion, three hundred seventy-eight million, seven hundred ninety-four thousand, nine hundred thirty-one".