166211597 has 2 divisors, whose sum is σ = 166211598. Its totient is φ = 166211596.

The previous prime is 166211527. The next prime is 166211609. The reversal of 166211597 is 795112661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121308196 + 44903401 = 11014^2 + 6701^2 .

It is a cyclic number.

It is not a de Polignac number, because 166211597 - 2¹⁶ = 166146061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166211597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166211527) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83105798 + 83105799.

It is an arithmetic number, because the mean of its divisors is an integer number (83105799).

Almost surely, 2^166211597 is an apocalyptic number.

It is an amenable number.

166211597 is a deficient number, since it is larger than the sum of its proper divisors (1).

166211597 is an equidigital number, since it uses as much as digits as its factorization.

166211597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 166211597 is about 12892.3076677529. The cubic root of 166211597 is about 549.8198826183.

The spelling of 166211597 in words is "one hundred sixty-six million, two hundred eleven thousand, five hundred ninety-seven".