166664123 has 2 divisors, whose sum is σ = 166664124. Its totient is φ = 166664122.

The previous prime is 166664119. The next prime is 166664149. The reversal of 166664123 is 321466661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166664123 - 2² = 166664119 is a prime.

It is not a weakly prime, because it can be changed into another prime (166664723) 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, 83332061 + 83332062.

It is an arithmetic number, because the mean of its divisors is an integer number (83332062).

Almost surely, 2^166664123 is an apocalyptic number.

166664123 is a deficient number, since it is larger than the sum of its proper divisors (1).

166664123 is an equidigital number, since it uses as much as digits as its factorization.

166664123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 35.

The square root of 166664123 is about 12909.8459711958. The cubic root of 166664123 is about 550.3184084674.

The spelling of 166664123 in words is "one hundred sixty-six million, six hundred sixty-four thousand, one hundred twenty-three".