6856538856 has 64 divisors (see below), whose sum is σ = 17553835200. Its totient is φ = 2230599168.

The previous prime is 6856538839. The next prime is 6856538861. The reversal of 6856538856 is 6588356586.

It is a self number, because there is not a number n which added to its sum of digits gives 6856538856.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2203830 + ... + 2206938.

It is an arithmetic number, because the mean of its divisors is an integer number (274278675).

Almost surely, 2^6856538856 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 6856538856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8776917600).

6856538856 is an abundant number, since it is smaller than the sum of its proper divisors (10697296344).

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

6856538856 is a wasteful number, since it uses less digits than its factorization.

6856538856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5298 (or 5294 counting only the distinct ones).

The product of its digits is 41472000, while the sum is 60.

The square root of 6856538856 is about 82804.2200373870. The cubic root of 6856538856 is about 1899.7727203668.

The spelling of 6856538856 in words is "six billion, eight hundred fifty-six million, five hundred thirty-eight thousand, eight hundred fifty-six".