6818327993 has 2 divisors, whose sum is σ = 6818327994. Its totient is φ = 6818327992.

The previous prime is 6818327959. The next prime is 6818328001. The reversal of 6818327993 is 3997238186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4102146304 + 2716181689 = 64048^2 + 52117^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6818327993 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6818327933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3409163996 + 3409163997.

It is an arithmetic number, because the mean of its divisors is an integer number (3409163997).

Almost surely, 2^6818327993 is an apocalyptic number.

It is an amenable number.

6818327993 is a deficient number, since it is larger than the sum of its proper divisors (1).

6818327993 is an equidigital number, since it uses as much as digits as its factorization.

6818327993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 56.

The square root of 6818327993 is about 82573.1675122131. The cubic root of 6818327993 is about 1896.2370577837.

The spelling of 6818327993 in words is "six billion, eight hundred eighteen million, three hundred twenty-seven thousand, nine hundred ninety-three".