666195198 has 16 divisors (see below), whose sum is σ = 1334202240. Its totient is φ = 221763096.

The previous prime is 666195191. The next prime is 666195199. The reversal of 666195198 is 891591666.

It is a self number, because there is not a number n which added to its sum of digits gives 666195198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666195191) 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 7 ways as a sum of consecutive naturals, for example, 70690 + ... + 79557.

It is an arithmetic number, because the mean of its divisors is an integer number (83387640).

Almost surely, 2^666195198 is an apocalyptic number.

666195198 is an abundant number, since it is smaller than the sum of its proper divisors (668007042).

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

666195198 is a wasteful number, since it uses less digits than its factorization.

666195198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150991.

The product of its digits is 699840, while the sum is 51.

The square root of 666195198 is about 25810.7574084915. The cubic root of 666195198 is about 873.3744832633.

It can be divided in two parts, 66619 and 5198, that added together give a palindrome (71817).

The spelling of 666195198 in words is "six hundred sixty-six million, one hundred ninety-five thousand, one hundred ninety-eight".