16666841 has 2 divisors, whose sum is σ = 16666842. Its totient is φ = 16666840.

The previous prime is 16666829. The next prime is 16666873. The reversal of 16666841 is 14866661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8826841 + 7840000 = 2971^2 + 2800^2 .

It is a cyclic number.

It is not a de Polignac number, because 16666841 - 2¹⁴ = 16650457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16666795 and 16666804.

It is not a weakly prime, because it can be changed into another prime (16666891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8333420 + 8333421.

It is an arithmetic number, because the mean of its divisors is an integer number (8333421).

Almost surely, 2^16666841 is an apocalyptic number.

It is an amenable number.

16666841 is a deficient number, since it is larger than the sum of its proper divisors (1).

16666841 is an equidigital number, since it uses as much as digits as its factorization.

16666841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 16666841 is about 4082.5042559684. The cubic root of 16666841 is about 255.4373680833.

The spelling of 16666841 in words is "sixteen million, six hundred sixty-six thousand, eight hundred forty-one".