6866386857 has 48 divisors (see below), whose sum is σ = 11503410048. Its totient is φ = 3905341440.

The previous prime is 6866386843. The next prime is 6866386861. The reversal of 6866386857 is 7586836686.

6866386857 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6866386857 - 2⁴ = 6866386841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6866386794 and 6866386803.

It is not an unprimeable number, because it can be changed into a prime (6866384857) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92233 + ... + 149129.

It is an arithmetic number, because the mean of its divisors is an integer number (239654376).

Almost surely, 2^6866386857 is an apocalyptic number.

It is an amenable number.

6866386857 is a deficient number, since it is larger than the sum of its proper divisors (4637023191).

6866386857 is a wasteful number, since it uses less digits than its factorization.

6866386857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56990 (or 56987 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The square root of 6866386857 is about 82863.6642745178. The cubic root of 6866386857 is about 1900.6818288833.

The spelling of 6866386857 in words is "six billion, eight hundred sixty-six million, three hundred eighty-six thousand, eight hundred fifty-seven".