198065885 has 4 divisors (see below), whose sum is σ = 237679068. Its totient is φ = 158452704.

The previous prime is 198065873. The next prime is 198065887. The reversal of 198065885 is 588560891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 588560891 = 19 ⋅30976889.

It can be written as a sum of positive squares in 2 ways, for example, as 79103236 + 118962649 = 8894^2 + 10907^2 .

It is a cyclic number.

It is not a de Polignac number, because 198065885 - 2²⁴ = 181288669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198065887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19806584 + ... + 19806593.

It is an arithmetic number, because the mean of its divisors is an integer number (59419767).

Almost surely, 2^198065885 is an apocalyptic number.

It is an amenable number.

198065885 is a deficient number, since it is larger than the sum of its proper divisors (39613183).

198065885 is an equidigital number, since it uses as much as digits as its factorization.

198065885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39613182.

The product of its (nonzero) digits is 691200, while the sum is 50.

The square root of 198065885 is about 14073.5882062820. The cubic root of 198065885 is about 582.9123091670.

The spelling of 198065885 in words is "one hundred ninety-eight million, sixty-five thousand, eight hundred eighty-five".