18118938429384 has 128 divisors (see below), whose sum is σ = 50465882355840. Its totient is φ = 5384786245632.

The previous prime is 18118938429377. The next prime is 18118938429401. The reversal of 18118938429384 is 48392483981181.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4146774 + ... + 7309829.

It is an arithmetic number, because the mean of its divisors is an integer number (394264705905).

Almost surely, 2^{18118938429384} is an apocalyptic number.

It is an amenable number.

18118938429384 is an abundant number, since it is smaller than the sum of its proper divisors (32346943926456).

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

18118938429384 is a wasteful number, since it uses less digits than its factorization.

18118938429384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11456799 (or 11456795 counting only the distinct ones).

The product of its digits is 95551488, while the sum is 69.

The spelling of 18118938429384 in words is "eighteen trillion, one hundred eighteen billion, nine hundred thirty-eight million, four hundred twenty-nine thousand, three hundred eighty-four".