198910066 has 4 divisors (see below), whose sum is σ = 298365102. Its totient is φ = 99455032.

The previous prime is 198910057. The next prime is 198910097. The reversal of 198910066 is 660019891.

198910066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 135373225 + 63536841 = 11635^2 + 7971^2 .

It is a super-2 number, since 2×198910066² = 79130428712248712, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49727515 + ... + 49727518.

Almost surely, 2^198910066 is an apocalyptic number.

198910066 is a deficient number, since it is larger than the sum of its proper divisors (99455036).

198910066 is an equidigital number, since it uses as much as digits as its factorization.

198910066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99455035.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 198910066 is about 14103.5479933242. The cubic root of 198910066 is about 583.7392832151.

The spelling of 198910066 in words is "one hundred ninety-eight million, nine hundred ten thousand, sixty-six".