18381818388 has 24 divisors (see below), whose sum is σ = 42893102560. Its totient is φ = 6126959520.

The previous prime is 18381818381. The next prime is 18381818401. The reversal of 18381818388 is 88381818381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18381818381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434103 + ... + 474561.

Almost surely, 2^18381818388 is an apocalyptic number.

It is an amenable number.

18381818388 is an abundant number, since it is smaller than the sum of its proper divisors (24511284172).

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

18381818388 is a wasteful number, since it uses less digits than its factorization.

18381818388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78327 (or 78325 counting only the distinct ones).

The product of its digits is 2359296, while the sum is 57.

The spelling of 18381818388 in words is "eighteen billion, three hundred eighty-one million, eight hundred eighteen thousand, three hundred eighty-eight".