166004389 has 2 divisors, whose sum is σ = 166004390. Its totient is φ = 166004388.

The previous prime is 166004383. The next prime is 166004393. The reversal of 166004389 is 983400661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91527489 + 74476900 = 9567^2 + 8630^2 .

It is a cyclic number.

It is not a de Polignac number, because 166004389 - 2⁵ = 166004357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166004383) 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, 83002194 + 83002195.

It is an arithmetic number, because the mean of its divisors is an integer number (83002195).

Almost surely, 2^166004389 is an apocalyptic number.

It is an amenable number.

166004389 is a deficient number, since it is larger than the sum of its proper divisors (1).

166004389 is an equidigital number, since it uses as much as digits as its factorization.

166004389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 166004389 is about 12884.2690518322. The cubic root of 166004389 is about 549.5913096114.

The spelling of 166004389 in words is "one hundred sixty-six million, four thousand, three hundred eighty-nine".