6665719 has 2 divisors, whose sum is σ = 6665720. Its totient is φ = 6665718.

The previous prime is 6665707. The next prime is 6665741. The reversal of 6665719 is 9175666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6665719 - 2⁷ = 6665591 is a prime.

It is a super-2 number, since 2×6665719² = 88863619573922, which contains 22 as substring.

It is a Chen prime.

6665719 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332859 + 3332860.

It is an arithmetic number, because the mean of its divisors is an integer number (3332860).

Almost surely, 2^6665719 is an apocalyptic number.

6665719 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665719 is an equidigital number, since it uses as much as digits as its factorization.

6665719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 6665719 is about 2581.8053760886. The cubic root of 6665719 is about 188.1982874688.

The spelling of 6665719 in words is "six million, six hundred sixty-five thousand, seven hundred nineteen".