166388199 has 8 divisors (see below), whose sum is σ = 227010432. Its totient is φ = 108345720.

The previous prime is 166388179. The next prime is 166388203. The reversal of 166388199 is 991883661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166388199 - 2⁷ = 166388071 is a prime.

It is a super-3 number, since 3×166388199³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166388179) 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 in 7 ways as a sum of consecutive naturals, for example, 644787 + ... + 645044.

It is an arithmetic number, because the mean of its divisors is an integer number (28376304).

Almost surely, 2^166388199 is an apocalyptic number.

166388199 is a deficient number, since it is larger than the sum of its proper divisors (60622233).

166388199 is a wasteful number, since it uses less digits than its factorization.

166388199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289877.

The product of its digits is 559872, while the sum is 51.

The square root of 166388199 is about 12899.1549723228. The cubic root of 166388199 is about 550.0145439680.

The spelling of 166388199 in words is "one hundred sixty-six million, three hundred eighty-eight thousand, one hundred ninety-nine".