18813559338 has 32 divisors (see below), whose sum is σ = 47780469120. Its totient is φ = 5375302560.

The previous prime is 18813559309. The next prime is 18813559357. The reversal of 18813559338 is 83395531881.

18813559338 is a `hidden beast` number, since 1 + 8 + 8 + 13 + 5 + 593 + 38 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 in 15 ways as a sum of consecutive naturals, for example, 24885283 + ... + 24886038.

It is an arithmetic number, because the mean of its divisors is an integer number (1493139660).

Almost surely, 2^18813559338 is an apocalyptic number.

18813559338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18813559338 is an abundant number, since it is smaller than the sum of its proper divisors (28966909782).

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

18813559338 is a wasteful number, since it uses less digits than its factorization.

18813559338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49771339 (or 49771333 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The spelling of 18813559338 in words is "eighteen billion, eight hundred thirteen million, five hundred fifty-nine thousand, three hundred thirty-eight".