856379212956 has 72 divisors (see below), whose sum is σ = 2245860677424. Its totient is φ = 285339075840.

The previous prime is 856379212939. The next prime is 856379212963. The reversal of 856379212956 is 659212973658.

856379212956 is a `hidden beast` number, since 8 + 563 + 7 + 9 + 2 + 12 + 9 + 56 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 856379212893 and 856379212902.

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 23 ways as a sum of consecutive naturals, for example, 2129316 + ... + 2499348.

Almost surely, 2^856379212956 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 856379212956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1122930338712).

856379212956 is an abundant number, since it is smaller than the sum of its proper divisors (1389481464468).

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

856379212956 is a wasteful number, since it uses less digits than its factorization.

856379212956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372433 (or 372419 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 63.

The spelling of 856379212956 in words is "eight hundred fifty-six billion, three hundred seventy-nine million, two hundred twelve thousand, nine hundred fifty-six".