198516865 has 4 divisors (see below), whose sum is σ = 238220244. Its totient is φ = 158813488.

The previous prime is 198516847. The next prime is 198516917. The reversal of 198516865 is 568615891.

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

It can be written as a sum of positive squares in 2 ways, for example, as 94945536 + 103571329 = 9744^2 + 10177^2 .

It is a cyclic number.

It is not a de Polignac number, because 198516865 - 2⁵ = 198516833 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19851682 + ... + 19851691.

It is an arithmetic number, because the mean of its divisors is an integer number (59555061).

Almost surely, 2^198516865 is an apocalyptic number.

It is an amenable number.

198516865 is a deficient number, since it is larger than the sum of its proper divisors (39703379).

198516865 is an equidigital number, since it uses as much as digits as its factorization.

198516865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39703378.

The product of its digits is 518400, while the sum is 49.

The square root of 198516865 is about 14089.6013073472. The cubic root of 198516865 is about 583.3543885371.

The spelling of 198516865 in words is "one hundred ninety-eight million, five hundred sixteen thousand, eight hundred sixty-five".