6778933817 has 2 divisors, whose sum is σ = 6778933818. Its totient is φ = 6778933816.

The previous prime is 6778933801. The next prime is 6778933883. The reversal of 6778933817 is 7183398776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3648643216 + 3130290601 = 60404^2 + 55949^2 .

It is a cyclic number.

It is not a de Polignac number, because 6778933817 - 2⁴ = 6778933801 is a prime.

It is not a weakly prime, because it can be changed into another prime (6778930817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389466908 + 3389466909.

It is an arithmetic number, because the mean of its divisors is an integer number (3389466909).

Almost surely, 2^6778933817 is an apocalyptic number.

It is an amenable number.

6778933817 is a deficient number, since it is larger than the sum of its proper divisors (1).

6778933817 is an equidigital number, since it uses as much as digits as its factorization.

6778933817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10668672, while the sum is 59.

The square root of 6778933817 is about 82334.2809344929. The cubic root of 6778933817 is about 1892.5780460814.

The spelling of 6778933817 in words is "six billion, seven hundred seventy-eight million, nine hundred thirty-three thousand, eight hundred seventeen".