18166373 has 2 divisors, whose sum is σ = 18166374. Its totient is φ = 18166372.

The previous prime is 18166307. The next prime is 18166391. The reversal of 18166373 is 37366181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17623204 + 543169 = 4198^2 + 737^2 .

It is a cyclic number.

It is not a de Polignac number, because 18166373 - 2⁸ = 18166117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18166873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9083186 + 9083187.

It is an arithmetic number, because the mean of its divisors is an integer number (9083187).

Almost surely, 2^18166373 is an apocalyptic number.

It is an amenable number.

18166373 is a deficient number, since it is larger than the sum of its proper divisors (1).

18166373 is an equidigital number, since it uses as much as digits as its factorization.

18166373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 18166373 is about 4262.2028342161. The cubic root of 18166373 is about 262.8791099626.

The spelling of 18166373 in words is "eighteen million, one hundred sixty-six thousand, three hundred seventy-three".