6856878556 has 24 divisors (see below), whose sum is σ = 13394836224. Its totient is φ = 3044279280.

The previous prime is 6856878547. The next prime is 6856878559. The reversal of 6856878556 is 6558786586.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6856878559) 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, 1810180 + ... + 1813963.

It is an arithmetic number, because the mean of its divisors is an integer number (558118176).

Almost surely, 2^6856878556 is an apocalyptic number.

It is an amenable number.

6856878556 is a deficient number, since it is larger than the sum of its proper divisors (6537957668).

6856878556 is a wasteful number, since it uses less digits than its factorization.

6856878556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3624201 (or 3624199 counting only the distinct ones).

The product of its digits is 96768000, while the sum is 64.

The square root of 6856878556 is about 82806.2712359396. The cubic root of 6856878556 is about 1899.8040939285.

The spelling of 6856878556 in words is "six billion, eight hundred fifty-six million, eight hundred seventy-eight thousand, five hundred fifty-six".