66009198 has 48 divisors (see below), whose sum is σ = 143468496. Its totient is φ = 20171520.

The previous prime is 66009187. The next prime is 66009239. The reversal of 66009198 is 89190066.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 640815 + ... + 640917.

It is an arithmetic number, because the mean of its divisors is an integer number (2988927).

Almost surely, 2^66009198 is an apocalyptic number.

66009198 is an abundant number, since it is smaller than the sum of its proper divisors (77459298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66009198 is a wasteful number, since it uses less digits than its factorization.

66009198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 66009198 is about 8124.6044826810. The cubic root of 66009198 is about 404.1427745870.

The spelling of 66009198 in words is "sixty-six million, nine thousand, one hundred ninety-eight".