665835198 has 16 divisors (see below), whose sum is σ = 1521909120. Its totient is φ = 190238616.

The previous prime is 665835193. The next prime is 665835199. The reversal of 665835198 is 891538566.

It is a self number, because there is not a number n which added to its sum of digits gives 665835198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665835193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7926568 + ... + 7926651.

It is an arithmetic number, because the mean of its divisors is an integer number (95119320).

Almost surely, 2^665835198 is an apocalyptic number.

665835198 is an abundant number, since it is smaller than the sum of its proper divisors (856073922).

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

665835198 is a wasteful number, since it uses less digits than its factorization.

665835198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15853231.

The product of its digits is 1555200, while the sum is 51.

The square root of 665835198 is about 25803.7826296844. The cubic root of 665835198 is about 873.2171362542.

The spelling of 665835198 in words is "six hundred sixty-five million, eight hundred thirty-five thousand, one hundred ninety-eight".