18036508385280 has 896 divisors, whose sum is σ = 72085418090496. Its totient is φ = 3741017702400.

The previous prime is 18036508385213. The next prime is 18036508385281. The reversal of 18036508385280 is 8258380563081.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (896).

It is a self number, because there is not a number n which added to its sum of digits gives 18036508385280.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18036508385281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6462380685 + ... + 6462383475.

Almost surely, 2^{18036508385280} is an apocalyptic number.

18036508385280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18036508385280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36042709045248).

18036508385280 is an abundant number, since it is smaller than the sum of its proper divisors (54048909705216).

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

18036508385280 is a wasteful number, since it uses less digits than its factorization.

18036508385280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526 (or 3502 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 57.

The spelling of 18036508385280 in words is "eighteen trillion, thirty-six billion, five hundred eight million, three hundred eighty-five thousand, two hundred eighty".