6618664198 has 16 divisors (see below), whose sum is σ = 9974166336. Its totient is φ = 3293968680.

The previous prime is 6618664159. The next prime is 6618664223. The reversal of 6618664198 is 8914668166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 543565 + ... + 555607.

It is an arithmetic number, because the mean of its divisors is an integer number (623385396).

Almost surely, 2^6618664198 is an apocalyptic number.

6618664198 is a deficient number, since it is larger than the sum of its proper divisors (3355502138).

6618664198 is a wasteful number, since it uses less digits than its factorization.

6618664198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13299.

The product of its digits is 2985984, while the sum is 55.

The square root of 6618664198 is about 81355.1731483622. The cubic root of 6618664198 is about 1877.5439670839.

The spelling of 6618664198 in words is "six billion, six hundred eighteen million, six hundred sixty-four thousand, one hundred ninety-eight".