198664219 has 4 divisors (see below), whose sum is σ = 213946096. Its totient is φ = 183382344.

The previous prime is 198664201. The next prime is 198664259. The reversal of 198664219 is 912466891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198664219 - 2⁵ = 198664187 is a prime.

It is a super-2 number, since 2×198664219² = 78934943821759922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (198664259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7640919 + ... + 7640944.

It is an arithmetic number, because the mean of its divisors is an integer number (53486524).

Almost surely, 2^198664219 is an apocalyptic number.

198664219 is a deficient number, since it is larger than the sum of its proper divisors (15281877).

198664219 is a wasteful number, since it uses less digits than its factorization.

198664219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15281876.

The product of its digits is 186624, while the sum is 46.

The square root of 198664219 is about 14094.8295129810. The cubic root of 198664219 is about 583.4986891952.

The spelling of 198664219 in words is "one hundred ninety-eight million, six hundred sixty-four thousand, two hundred nineteen".