6666239 has 2 divisors, whose sum is σ = 6666240. Its totient is φ = 6666238.

The previous prime is 6666229. The next prime is 6666241. The reversal of 6666239 is 9326666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6666239 - 2⁴ = 6666223 is a prime.

Together with 6666241, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333119 + 3333120.

It is an arithmetic number, because the mean of its divisors is an integer number (3333120).

Almost surely, 2^6666239 is an apocalyptic number.

6666239 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666239 is an equidigital number, since it uses as much as digits as its factorization.

6666239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 38.

The square root of 6666239 is about 2581.9060788495. The cubic root of 6666239 is about 188.2031811927.

The spelling of 6666239 in words is "six million, six hundred sixty-six thousand, two hundred thirty-nine".