166194617 has 2 divisors, whose sum is σ = 166194618. Its totient is φ = 166194616.

The previous prime is 166194571. The next prime is 166194629. The reversal of 166194617 is 716491661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109327936 + 56866681 = 10456^2 + 7541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166194617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166194817) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83097308 + 83097309.

It is an arithmetic number, because the mean of its divisors is an integer number (83097309).

Almost surely, 2^166194617 is an apocalyptic number.

It is an amenable number.

166194617 is a deficient number, since it is larger than the sum of its proper divisors (1).

166194617 is an equidigital number, since it uses as much as digits as its factorization.

166194617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 166194617 is about 12891.6491187125. The cubic root of 166194617 is about 549.8011589758.

The spelling of 166194617 in words is "one hundred sixty-six million, one hundred ninety-four thousand, six hundred seventeen".