198665193 has 16 divisors (see below), whose sum is σ = 274242816. Its totient is φ = 127843200.

The previous prime is 198665183. The next prime is 198665209. The reversal of 198665193 is 391566891.

It is not a de Polignac number, because 198665193 - 2⁸ = 198664937 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (198665123) 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, 643 + ... + 19943.

It is an arithmetic number, because the mean of its divisors is an integer number (17140176).

Almost surely, 2^198665193 is an apocalyptic number.

It is an amenable number.

198665193 is a deficient number, since it is larger than the sum of its proper divisors (75577623).

198665193 is a wasteful number, since it uses less digits than its factorization.

198665193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19424.

The product of its digits is 349920, while the sum is 48.

The square root of 198665193 is about 14094.8640646159. The cubic root of 198665193 is about 583.4996427754.

The spelling of 198665193 in words is "one hundred ninety-eight million, six hundred sixty-five thousand, one hundred ninety-three".