666956198 has 8 divisors (see below), whose sum is σ = 1000633392. Its totient is φ = 333411736.

The previous prime is 666956197. The next prime is 666956201. The reversal of 666956198 is 891659666.

666956198 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666956197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19490 + ... + 41397.

It is an arithmetic number, because the mean of its divisors is an integer number (125079174).

Almost surely, 2^666956198 is an apocalyptic number.

666956198 is a deficient number, since it is larger than the sum of its proper divisors (333677194).

666956198 is a wasteful number, since it uses less digits than its factorization.

666956198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66366.

The product of its digits is 4199040, while the sum is 56.

The square root of 666956198 is about 25825.4951162606. The cubic root of 666956198 is about 873.7069108914.

The spelling of 666956198 in words is "six hundred sixty-six million, nine hundred fifty-six thousand, one hundred ninety-eight".