166636843 has 2 divisors, whose sum is σ = 166636844. Its totient is φ = 166636842.

The previous prime is 166636831. The next prime is 166636853. The reversal of 166636843 is 348636661.

It is a strong prime.

It is an emirp because it is prime and its reverse (348636661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166636843 - 2⁹ = 166636331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166636843.

It is not a weakly prime, because it can be changed into another prime (166636853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83318421 + 83318422.

It is an arithmetic number, because the mean of its divisors is an integer number (83318422).

Almost surely, 2^166636843 is an apocalyptic number.

166636843 is a deficient number, since it is larger than the sum of its proper divisors (1).

166636843 is an equidigital number, since it uses as much as digits as its factorization.

166636843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 43.

The square root of 166636843 is about 12908.7893700378. The cubic root of 166636843 is about 550.2883809984.

The spelling of 166636843 in words is "one hundred sixty-six million, six hundred thirty-six thousand, eight hundred forty-three".