856860691200 has 216 divisors, whose sum is σ = 2848468550928. Its totient is φ = 226827632640.

The previous prime is 856860691187. The next prime is 856860691259. The reversal of 856860691200 is 2196068658.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2467524 + ... + 2793276.

Almost surely, 2^856860691200 is an apocalyptic number.

856860691200 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856860691200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1424234275464).

856860691200 is an abundant number, since it is smaller than the sum of its proper divisors (1991607859728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856860691200 is a wasteful number, since it uses less digits than its factorization.

856860691200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325919 (or 325900 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 856860691200 in words is "eight hundred fifty-six billion, eight hundred sixty million, six hundred ninety-one thousand, two hundred".