6668719 has 2 divisors, whose sum is σ = 6668720. Its totient is φ = 6668718.

The previous prime is 6668713. The next prime is 6668723. The reversal of 6668719 is 9178666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6668719 - 2⁵ = 6668687 is a prime.

It is a super-2 number, since 2×6668719² = 88943626201922, which contains 22 as substring.

6668719 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6668713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334359 + 3334360.

It is an arithmetic number, because the mean of its divisors is an integer number (3334360).

Almost surely, 2^6668719 is an apocalyptic number.

6668719 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668719 is an equidigital number, since it uses as much as digits as its factorization.

6668719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 6668719 is about 2582.3862995300. The cubic root of 6668719 is about 188.2265169908.

The spelling of 6668719 in words is "six million, six hundred sixty-eight thousand, seven hundred nineteen".