166333813 has 2 divisors, whose sum is σ = 166333814. Its totient is φ = 166333812.

The previous prime is 166333801. The next prime is 166333819. The reversal of 166333813 is 318333661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147306769 + 19027044 = 12137^2 + 4362^2 .

It is a cyclic number.

It is not a de Polignac number, because 166333813 - 2⁹ = 166333301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166333819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83166906 + 83166907.

It is an arithmetic number, because the mean of its divisors is an integer number (83166907).

Almost surely, 2^166333813 is an apocalyptic number.

It is an amenable number.

166333813 is a deficient number, since it is larger than the sum of its proper divisors (1).

166333813 is an equidigital number, since it uses as much as digits as its factorization.

166333813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 34.

The square root of 166333813 is about 12897.0466774374. The cubic root of 166333813 is about 549.9546111304.

The spelling of 166333813 in words is "one hundred sixty-six million, three hundred thirty-three thousand, eight hundred thirteen".