6856863851 has 2 divisors, whose sum is σ = 6856863852. Its totient is φ = 6856863850.

The previous prime is 6856863833. The next prime is 6856863877. The reversal of 6856863851 is 1583686586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6856863851 - 2¹⁰ = 6856862827 is a prime.

It is not a weakly prime, because it can be changed into another prime (6856863551) 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 as a sum of consecutive naturals, namely, 3428431925 + 3428431926.

It is an arithmetic number, because the mean of its divisors is an integer number (3428431926).

Almost surely, 2^6856863851 is an apocalyptic number.

6856863851 is a deficient number, since it is larger than the sum of its proper divisors (1).

6856863851 is an equidigital number, since it uses as much as digits as its factorization.

6856863851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8294400, while the sum is 56.

The square root of 6856863851 is about 82806.1824443079. The cubic root of 6856863851 is about 1899.8027358451.

The spelling of 6856863851 in words is "six billion, eight hundred fifty-six million, eight hundred sixty-three thousand, eight hundred fifty-one".