16666361 has 2 divisors, whose sum is σ = 16666362. Its totient is φ = 16666360.

The previous prime is 16666357. The next prime is 16666367. The reversal of 16666361 is 16366661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15523600 + 1142761 = 3940^2 + 1069^2 .

It is an emirp because it is prime and its reverse (16366661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16666361 - 2² = 16666357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16666367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8333180 + 8333181.

It is an arithmetic number, because the mean of its divisors is an integer number (8333181).

Almost surely, 2^16666361 is an apocalyptic number.

It is an amenable number.

16666361 is a deficient number, since it is larger than the sum of its proper divisors (1).

16666361 is an equidigital number, since it uses as much as digits as its factorization.

16666361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 35.

The square root of 16666361 is about 4082.4454680987. The cubic root of 16666361 is about 255.4349158866.

The spelling of 16666361 in words is "sixteen million, six hundred sixty-six thousand, three hundred sixty-one".