18663088198 has 4 divisors (see below), whose sum is σ = 27994632300. Its totient is φ = 9331544098.

The previous prime is 18663088159. The next prime is 18663088247. The reversal of 18663088198 is 89188036681.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×18663088198² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4665772048 + ... + 4665772051.

It is an arithmetic number, because the mean of its divisors is an integer number (6998658075).

Almost surely, 2^18663088198 is an apocalyptic number.

18663088198 is a deficient number, since it is larger than the sum of its proper divisors (9331544102).

18663088198 is an equidigital number, since it uses as much as digits as its factorization.

18663088198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9331544101.

The product of its (nonzero) digits is 3981312, while the sum is 58.

The spelling of 18663088198 in words is "eighteen billion, six hundred sixty-three million, eighty-eight thousand, one hundred ninety-eight".