166028309 has 2 divisors, whose sum is σ = 166028310. Its totient is φ = 166028308.

The previous prime is 166028293. The next prime is 166028323. The reversal of 166028309 is 903820661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133287025 + 32741284 = 11545^2 + 5722^2 .

It is a cyclic number.

It is not a de Polignac number, because 166028309 - 2⁴ = 166028293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166028389) 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, 83014154 + 83014155.

It is an arithmetic number, because the mean of its divisors is an integer number (83014155).

Almost surely, 2^166028309 is an apocalyptic number.

It is an amenable number.

166028309 is a deficient number, since it is larger than the sum of its proper divisors (1).

166028309 is an equidigital number, since it uses as much as digits as its factorization.

166028309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 166028309 is about 12885.1972821529. The cubic root of 166028309 is about 549.6177056861.

The spelling of 166028309 in words is "one hundred sixty-six million, twenty-eight thousand, three hundred nine".