166440199 has 2 divisors, whose sum is σ = 166440200. Its totient is φ = 166440198.

The previous prime is 166440191. The next prime is 166440233. The reversal of 166440199 is 991044661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166440199 - 2³ = 166440191 is a prime.

It is a super-3 number, since 3×166440199³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166440191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83220099 + 83220100.

It is an arithmetic number, because the mean of its divisors is an integer number (83220100).

Almost surely, 2^166440199 is an apocalyptic number.

166440199 is a deficient number, since it is larger than the sum of its proper divisors (1).

166440199 is an equidigital number, since it uses as much as digits as its factorization.

166440199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 166440199 is about 12901.1704507769. The cubic root of 166440199 is about 550.0718352453.

The spelling of 166440199 in words is "one hundred sixty-six million, four hundred forty thousand, one hundred ninety-nine".