198085665 has 8 divisors (see below), whose sum is σ = 316937088. Its totient is φ = 105645680.

The previous prime is 198085663. The next prime is 198085673. The reversal of 198085665 is 566580891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198085665 - 2¹ = 198085663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198085663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6602841 + ... + 6602870.

It is an arithmetic number, because the mean of its divisors is an integer number (39617136).

Almost surely, 2^198085665 is an apocalyptic number.

198085665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

198085665 is a deficient number, since it is larger than the sum of its proper divisors (118851423).

198085665 is a wasteful number, since it uses less digits than its factorization.

198085665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13205719.

The product of its (nonzero) digits is 518400, while the sum is 48.

The square root of 198085665 is about 14074.2909235244. The cubic root of 198085665 is about 582.9317128479.

The spelling of 198085665 in words is "one hundred ninety-eight million, eighty-five thousand, six hundred sixty-five".