9918408865512 has 128 divisors (see below), whose sum is σ = 28631194675200. Its totient is φ = 2804576894208.

The previous prime is 9918408865483. The next prime is 9918408865529. The reversal of 9918408865512 is 2155688048199.

9918408865512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 27838158 + ... + 28192194.

It is an arithmetic number, because the mean of its divisors is an integer number (223681208400).

Almost surely, 2^{9918408865512} 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 9918408865512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14315597337600).

9918408865512 is an abundant number, since it is smaller than the sum of its proper divisors (18712785809688).

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

9918408865512 is a wasteful number, since it uses less digits than its factorization.

9918408865512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355775 (or 355771 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 66.

The spelling of 9918408865512 in words is "nine trillion, nine hundred eighteen billion, four hundred eight million, eight hundred sixty-five thousand, five hundred twelve".