198960665 has 4 divisors (see below), whose sum is σ = 238752804. Its totient is φ = 159168528.

The previous prime is 198960637. The next prime is 198960679. The reversal of 198960665 is 566069891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566069891 = 263 ⋅2152357.

It can be written as a sum of positive squares in 2 ways, for example, as 19963024 + 178997641 = 4468^2 + 13379^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198960665 is a prime.

It is a Duffinian number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 19896062 + ... + 19896071.

It is an arithmetic number, because the mean of its divisors is an integer number (59688201).

Almost surely, 2^198960665 is an apocalyptic number.

It is an amenable number.

198960665 is a deficient number, since it is larger than the sum of its proper divisors (39792139).

198960665 is an equidigital number, since it uses as much as digits as its factorization.

198960665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39792138.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 198960665 is about 14105.3417186540. The cubic root of 198960665 is about 583.7887764700.

The spelling of 198960665 in words is "one hundred ninety-eight million, nine hundred sixty thousand, six hundred sixty-five".