166820199 has 32 divisors (see below), whose sum is σ = 278423040. Its totient is φ = 86493312.

The previous prime is 166820197. The next prime is 166820221. The reversal of 166820199 is 991028661.

It is not a de Polignac number, because 166820199 - 2¹ = 166820197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166820199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166820197) 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 31 ways as a sum of consecutive naturals, for example, 10929 + ... + 21285.

It is an arithmetic number, because the mean of its divisors is an integer number (8700720).

Almost surely, 2^166820199 is an apocalyptic number.

166820199 is a deficient number, since it is larger than the sum of its proper divisors (111602841).

166820199 is a wasteful number, since it uses less digits than its factorization.

166820199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10439.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 166820199 is about 12915.8894002697. The cubic root of 166820199 is about 550.4901404849.

The spelling of 166820199 in words is "one hundred sixty-six million, eight hundred twenty thousand, one hundred ninety-nine".