6666841 has 2 divisors, whose sum is σ = 6666842. Its totient is φ = 6666840.

The previous prime is 6666833. The next prime is 6666883. The reversal of 6666841 is 1486666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6579225 + 87616 = 2565^2 + 296^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666841 - 2³ = 6666833 is a prime.

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 6666841.

It is not a weakly prime, because it can be changed into another prime (6666241) 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, 3333420 + 3333421.

It is an arithmetic number, because the mean of its divisors is an integer number (3333421).

Almost surely, 2^6666841 is an apocalyptic number.

It is an amenable number.

6666841 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666841 is an equidigital number, since it uses as much as digits as its factorization.

6666841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 37.

The square root of 6666841 is about 2582.0226567557. The cubic root of 6666841 is about 188.2088463014.

The spelling of 6666841 in words is "six million, six hundred sixty-six thousand, eight hundred forty-one".