166668500197 has 2 divisors, whose sum is σ = 166668500198. Its totient is φ = 166668500196.

The previous prime is 166668500171. The next prime is 166668500231. The reversal of 166668500197 is 791005866661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113273306721 + 53395193476 = 336561^2 + 231074^2 .

It is a cyclic number.

It is not a de Polignac number, because 166668500197 - 2¹⁵ = 166668467429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166668540197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83334250098 + 83334250099.

It is an arithmetic number, because the mean of its divisors is an integer number (83334250099).

Almost surely, 2^166668500197 is an apocalyptic number.

It is an amenable number.

166668500197 is a deficient number, since it is larger than the sum of its proper divisors (1).

166668500197 is an equidigital number, since it uses as much as digits as its factorization.

166668500197 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 166668500197 in words is "one hundred sixty-six billion, six hundred sixty-eight million, five hundred thousand, one hundred ninety-seven".