18389985335708 has 12 divisors (see below), whose sum is σ = 36779970671472. Its totient is φ = 7881422286720.

The previous prime is 18389985335677. The next prime is 18389985335753. The reversal of 18389985335708 is 80753358998381.

18389985335708 is an admirable number.

It is a super-2 number, since 2×18389985335708² (a number of 27 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328392595253 + ... + 328392595308.

It is an arithmetic number, because the mean of its divisors is an integer number (3064997555956).

Almost surely, 2^{18389985335708} is an apocalyptic number.

It is an amenable number.

18389985335708 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18389985335708 is a wasteful number, since it uses less digits than its factorization.

18389985335708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656785190572 (or 656785190570 counting only the distinct ones).

The product of its (nonzero) digits is 1567641600, while the sum is 77.

The spelling of 18389985335708 in words is "eighteen trillion, three hundred eighty-nine billion, nine hundred eighty-five million, three hundred thirty-five thousand, seven hundred eight".