6666347 has 2 divisors, whose sum is σ = 6666348. Its totient is φ = 6666346.

The previous prime is 6666337. The next prime is 6666353. The reversal of 6666347 is 7436666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6666347 - 2²⁰ = 5617771 is a prime.

It is a super-3 number, since 3×6666347³ (a number of 21 digits) contains 333 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6666347.

It is not a weakly prime, because it can be changed into another prime (6666337) 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, 3333173 + 3333174.

It is an arithmetic number, because the mean of its divisors is an integer number (3333174).

Almost surely, 2^6666347 is an apocalyptic number.

6666347 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666347 is an equidigital number, since it uses as much as digits as its factorization.

6666347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 38.

The square root of 6666347 is about 2581.9269935457. The cubic root of 6666347 is about 188.2041975496.

The spelling of 6666347 in words is "six million, six hundred sixty-six thousand, three hundred forty-seven".