16664199 has 16 divisors (see below), whose sum is σ = 23661792. Its totient is φ = 10395648.

The previous prime is 16664191. The next prime is 16664203. The reversal of 16664199 is 99146661.

It is not a de Polignac number, because 16664199 - 2³ = 16664191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16664199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16664191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8997 + ... + 10689.

It is an arithmetic number, because the mean of its divisors is an integer number (1478862).

Almost surely, 2^16664199 is an apocalyptic number.

16664199 is a deficient number, since it is larger than the sum of its proper divisors (6997593).

16664199 is a wasteful number, since it uses less digits than its factorization.

16664199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906.

The product of its digits is 69984, while the sum is 42.

The square root of 16664199 is about 4082.1806672415. The cubic root of 16664199 is about 255.4238702007.

The spelling of 16664199 in words is "sixteen million, six hundred sixty-four thousand, one hundred ninety-nine".