198666065 has 16 divisors (see below), whose sum is σ = 267902208. Its totient is φ = 140327616.

The previous prime is 198666059. The next prime is 198666089. The reversal of 198666065 is 560666891.

It is not a de Polignac number, because 198666065 - 2⁶ = 198666001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 64949 + ... + 67938.

It is an arithmetic number, because the mean of its divisors is an integer number (16743888).

Almost surely, 2^198666065 is an apocalyptic number.

It is an amenable number.

198666065 is a deficient number, since it is larger than the sum of its proper divisors (69236143).

198666065 is a wasteful number, since it uses less digits than its factorization.

198666065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132928.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 198666065 is about 14094.8949978352. The cubic root of 198666065 is about 583.5004964913.

The spelling of 198666065 in words is "one hundred ninety-eight million, six hundred sixty-six thousand, sixty-five".