18135630198 has 72 divisors (see below), whose sum is σ = 45858764952. Its totient is φ = 5164653312.

The previous prime is 18135630187. The next prime is 18135630241. The reversal of 18135630198 is 89103653181.

It is a happy number.

18135630198 is a `hidden beast` number, since 1 + 8 + 1 + 3 + 5 + 630 + 1 + 9 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 237286 + ... + 304262.

It is an arithmetic number, because the mean of its divisors is an integer number (636927291).

Almost surely, 2^18135630198 is an apocalyptic number.

18135630198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18135630198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22929382476).

18135630198 is an abundant number, since it is smaller than the sum of its proper divisors (27723134754).

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

18135630198 is a wasteful number, since it uses less digits than its factorization.

18135630198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67306 (or 67296 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 18135630198 in words is "eighteen billion, one hundred thirty-five million, six hundred thirty thousand, one hundred ninety-eight".