6815680085 has 4 divisors (see below), whose sum is σ = 8178816108. Its totient is φ = 5452544064.

The previous prime is 6815680063. The next prime is 6815680093. The reversal of 6815680085 is 5800865186.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2388374641 + 4427305444 = 48871^2 + 66538^2 .

It is a cyclic number.

It is not a de Polignac number, because 6815680085 - 2¹⁸ = 6815417941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 681568004 + ... + 681568013.

It is an arithmetic number, because the mean of its divisors is an integer number (2044704027).

Almost surely, 2^6815680085 is an apocalyptic number.

It is an amenable number.

6815680085 is a deficient number, since it is larger than the sum of its proper divisors (1363136023).

6815680085 is a wasteful number, since it uses less digits than its factorization.

6815680085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363136022.

The product of its (nonzero) digits is 460800, while the sum is 47.

The square root of 6815680085 is about 82557.1322479167. The cubic root of 6815680085 is about 1895.9915571566.

The spelling of 6815680085 in words is "six billion, eight hundred fifteen million, six hundred eighty thousand, eighty-five".