6816804859 has 4 divisors (see below), whose sum is σ = 6820304400. Its totient is φ = 6813305320.

The previous prime is 6816804833. The next prime is 6816804877. The reversal of 6816804859 is 9584086186.

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 6816804859 - 2³¹ = 4669321211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6816804829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1746847 + ... + 1750744.

It is an arithmetic number, because the mean of its divisors is an integer number (1705076100).

Almost surely, 2^6816804859 is an apocalyptic number.

6816804859 is a deficient number, since it is larger than the sum of its proper divisors (3499541).

6816804859 is a wasteful number, since it uses less digits than its factorization.

6816804859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3499540.

The product of its (nonzero) digits is 3317760, while the sum is 55.

The square root of 6816804859 is about 82563.9440615575. The cubic root of 6816804859 is about 1896.0958482756.

The spelling of 6816804859 in words is "six billion, eight hundred sixteen million, eight hundred four thousand, eight hundred fifty-nine".