6778104665 has 4 divisors (see below), whose sum is σ = 8133725604. Its totient is φ = 5422483728.

The previous prime is 6778104653. The next prime is 6778104679. The reversal of 6778104665 is 5664018776.

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 3116765584 + 3661339081 = 55828^2 + 60509^2 .

It is a cyclic number.

It is not a de Polignac number, because 6778104665 - 2⁴ = 6778104649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 677810462 + ... + 677810471.

It is an arithmetic number, because the mean of its divisors is an integer number (2033431401).

Almost surely, 2^6778104665 is an apocalyptic number.

It is an amenable number.

6778104665 is a deficient number, since it is larger than the sum of its proper divisors (1355620939).

6778104665 is a wasteful number, since it uses less digits than its factorization.

6778104665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355620938.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The square root of 6778104665 is about 82329.2455024337. The cubic root of 6778104665 is about 1892.5008806107.

The spelling of 6778104665 in words is "six billion, seven hundred seventy-eight million, one hundred four thousand, six hundred sixty-five".