18986128943408 has 80 divisors (see below), whose sum is σ = 41429888793600. Its totient is φ = 8350539091200.

The previous prime is 18986128943381. The next prime is 18986128943437. The reversal of 18986128943408 is 80434982168981.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40726418 + ... + 41189966.

It is an arithmetic number, because the mean of its divisors is an integer number (517873609920).

Almost surely, 2^{18986128943408} 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 18986128943408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20714944396800).

18986128943408 is an abundant number, since it is smaller than the sum of its proper divisors (22443759850192).

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

18986128943408 is a wasteful number, since it uses less digits than its factorization.

18986128943408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471106 (or 471100 counting only the distinct ones).

The product of its (nonzero) digits is 191102976, while the sum is 71.

The spelling of 18986128943408 in words is "eighteen trillion, nine hundred eighty-six billion, one hundred twenty-eight million, nine hundred forty-three thousand, four hundred eight".