6666719 has 2 divisors, whose sum is σ = 6666720. Its totient is φ = 6666718.

The previous prime is 6666689. The next prime is 6666749. The reversal of 6666719 is 9176666.

It is a balanced prime because it is at equal distance from previous prime (6666689) and next prime (6666749).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6666719 is a prime.

It is a super-2 number, since 2×6666719² = 88890284449922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333359 + 3333360.

It is an arithmetic number, because the mean of its divisors is an integer number (3333360).

Almost surely, 2^6666719 is an apocalyptic number.

6666719 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666719 is an equidigital number, since it uses as much as digits as its factorization.

6666719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 6666719 is about 2581.9990317581. Note that the first 3 decimals coincide. The cubic root of 6666719 is about 188.2076982504.

The spelling of 6666719 in words is "six million, six hundred sixty-six thousand, seven hundred nineteen".