856905899796 has 288 divisors, whose sum is σ = 2362734528000. Its totient is φ = 268506171648.

The previous prime is 856905899737. The next prime is 856905899809. The reversal of 856905899796 is 697998509658.

It is a happy number.

It is a super-2 number, since 2×856905899796² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1683508390 + ... + 1683508898.

Almost surely, 2^856905899796 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856905899796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1181367264000).

856905899796 is an abundant number, since it is smaller than the sum of its proper divisors (1505828628204).

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

856905899796 is a wasteful number, since it uses less digits than its factorization.

856905899796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020 (or 989 counting only the distinct ones).

The product of its (nonzero) digits is 2645395200, while the sum is 81.

The spelling of 856905899796 in words is "eight hundred fifty-six billion, nine hundred five million, eight hundred ninety-nine thousand, seven hundred ninety-six".