6684779 has 2 divisors, whose sum is σ = 6684780. Its totient is φ = 6684778.

The previous prime is 6684773. The next prime is 6684781. The reversal of 6684779 is 9774866.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6684779 is a prime.

Together with 6684781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6684773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3342389 + 3342390.

It is an arithmetic number, because the mean of its divisors is an integer number (3342390).

Almost surely, 2^6684779 is an apocalyptic number.

6684779 is a deficient number, since it is larger than the sum of its proper divisors (1).

6684779 is an equidigital number, since it uses as much as digits as its factorization.

6684779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The square root of 6684779 is about 2585.4939566744. The cubic root of 6684779 is about 188.3774952346.

The spelling of 6684779 in words is "six million, six hundred eighty-four thousand, seven hundred seventy-nine".