166489597 has 2 divisors, whose sum is σ = 166489598. Its totient is φ = 166489596.

The previous prime is 166489537. The next prime is 166489601. The reversal of 166489597 is 795984661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131194116 + 35295481 = 11454^2 + 5941^2 .

It is a cyclic number.

It is not a de Polignac number, because 166489597 - 2⁷ = 166489469 is a prime.

It is a super-3 number, since 3×166489597³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166489537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83244798 + 83244799.

It is an arithmetic number, because the mean of its divisors is an integer number (83244799).

Almost surely, 2^166489597 is an apocalyptic number.

It is an amenable number.

166489597 is a deficient number, since it is larger than the sum of its proper divisors (1).

166489597 is an equidigital number, since it uses as much as digits as its factorization.

166489597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 55.

The square root of 166489597 is about 12903.0847862052. The cubic root of 166489597 is about 550.1262487042.

The spelling of 166489597 in words is "one hundred sixty-six million, four hundred eighty-nine thousand, five hundred ninety-seven".