198650065 has 4 divisors (see below), whose sum is σ = 238380084. Its totient is φ = 158920048.

The previous prime is 198650051. The next prime is 198650129. The reversal of 198650065 is 560056891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560056891 = 17 ⋅32944523.

It can be written as a sum of positive squares in 2 ways, for example, as 149523984 + 49126081 = 12228^2 + 7009^2 .

It is a cyclic number.

It is not a de Polignac number, because 198650065 - 2⁵ = 198650033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19865002 + ... + 19865011.

It is an arithmetic number, because the mean of its divisors is an integer number (59595021).

Almost surely, 2^198650065 is an apocalyptic number.

It is an amenable number.

198650065 is a deficient number, since it is larger than the sum of its proper divisors (39730019).

198650065 is an equidigital number, since it uses as much as digits as its factorization.

198650065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39730018.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 198650065 is about 14094.3274050236. The cubic root of 198650065 is about 583.4848315805.

The spelling of 198650065 in words is "one hundred ninety-eight million, six hundred fifty thousand, sixty-five".