6851863647 has 24 divisors (see below), whose sum is σ = 9933917760. Its totient is φ = 4550971200.

The previous prime is 6851863631. The next prime is 6851863649. The reversal of 6851863647 is 7463681586.

6851863647 is a `hidden beast` number, since 6 + 8 + 518 + 63 + 64 + 7 = 666.

It is not a de Polignac number, because 6851863647 - 2⁴ = 6851863631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6851863593 and 6851863602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6851863649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3603397 + ... + 3605297.

It is an arithmetic number, because the mean of its divisors is an integer number (413913240).

Almost surely, 2^6851863647 is an apocalyptic number.

6851863647 is a deficient number, since it is larger than the sum of its proper divisors (3082054113).

6851863647 is a wasteful number, since it uses less digits than its factorization.

6851863647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3183 (or 3180 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 6851863647 is about 82775.9847238316. The cubic root of 6851863647 is about 1899.3408283098.

The spelling of 6851863647 in words is "six billion, eight hundred fifty-one million, eight hundred sixty-three thousand, six hundred forty-seven".