18013988512 has 72 divisors (see below), whose sum is σ = 38445249024. Its totient is φ = 8305000704.

The previous prime is 18013988491. The next prime is 18013988549. The reversal of 18013988512 is 21588931081.

It is a super-2 number, since 2×18013988512² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8992503 + ... + 8994505.

It is an arithmetic number, because the mean of its divisors is an integer number (533961792).

Almost surely, 2^18013988512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18013988512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19222624512).

18013988512 is an abundant number, since it is smaller than the sum of its proper divisors (20431260512).

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

18013988512 is a wasteful number, since it uses less digits than its factorization.

18013988512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3702 (or 3681 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 46.

The spelling of 18013988512 in words is "eighteen billion, thirteen million, nine hundred eighty-eight thousand, five hundred twelve".