6679999 has 2 divisors, whose sum is σ = 6680000. Its totient is φ = 6679998.

The previous prime is 6679993. The next prime is 6680021. The reversal of 6679999 is 9999766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6679999 - 2¹⁹ = 6155711 is a prime.

6679999 is a modest number, since divided by 9999 gives 667 as remainder.

6679999 is a lucky number.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6679993) by changing a digit.

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 as a sum of consecutive naturals, namely, 3339999 + 3340000.

It is an arithmetic number, because the mean of its divisors is an integer number (3340000).

Almost surely, 2^6679999 is an apocalyptic number.

6679999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6679999 is an equidigital number, since it uses as much as digits as its factorization.

6679999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1653372, while the sum is 55.

The square root of 6679999 is about 2584.5694032082. The cubic root of 6679999 is about 188.3325842941.

The spelling of 6679999 in words is "six million, six hundred seventy-nine thousand, nine hundred ninety-nine".