6856864385 has 32 divisors (see below), whose sum is σ = 9501518592. Its totient is φ = 4653158400.

The previous prime is 6856864373. The next prime is 6856864411. The reversal of 6856864385 is 5834686586.

It is not a de Polignac number, because 6856864385 - 2⁴ = 6856864369 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1690610 + ... + 1694660.

It is an arithmetic number, because the mean of its divisors is an integer number (296922456).

Almost surely, 2^6856864385 is an apocalyptic number.

It is an amenable number.

6856864385 is a deficient number, since it is larger than the sum of its proper divisors (2644654207).

6856864385 is a wasteful number, since it uses less digits than its factorization.

6856864385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4553.

The product of its digits is 33177600, while the sum is 59.

The square root of 6856864385 is about 82806.1856687047. The cubic root of 6856864385 is about 1899.8027851628.

The spelling of 6856864385 in words is "six billion, eight hundred fifty-six million, eight hundred sixty-four thousand, three hundred eighty-five".