6856171863 has 4 divisors (see below), whose sum is σ = 9141562488. Its totient is φ = 4570781240.

The previous prime is 6856171843. The next prime is 6856171879. The reversal of 6856171863 is 3681716586.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6856171863 - 2⁹ = 6856171351 is a prime.

It is a super-2 number, since 2×6856171863² = 94014185229985781538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6856171843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1142695308 + ... + 1142695313.

It is an arithmetic number, because the mean of its divisors is an integer number (2285390622).

Almost surely, 2^6856171863 is an apocalyptic number.

6856171863 is a deficient number, since it is larger than the sum of its proper divisors (2285390625).

6856171863 is a wasteful number, since it uses less digits than its factorization.

6856171863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285390624.

The product of its digits is 1451520, while the sum is 51.

The square root of 6856171863 is about 82802.0039793724. The cubic root of 6856171863 is about 1899.7388249499.

The spelling of 6856171863 in words is "six billion, eight hundred fifty-six million, one hundred seventy-one thousand, eight hundred sixty-three".