18280381184520 has 1024 divisors, whose sum is σ = 72393340723200. Its totient is φ = 3589148344320.

The previous prime is 18280381184489. The next prime is 18280381184579. The reversal of 18280381184520 is 2548118308281.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 1077653559 + ... + 1077670521.

It is an arithmetic number, because the mean of its divisors is an integer number (70696621800).

Almost surely, 2^{18280381184520} is an apocalyptic number.

18280381184520 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 18280381184520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36196670361600).

18280381184520 is an abundant number, since it is smaller than the sum of its proper divisors (54112959538680).

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

18280381184520 is a wasteful number, since it uses less digits than its factorization.

18280381184520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17150 (or 17146 counting only the distinct ones).

The product of its (nonzero) digits is 983040, while the sum is 51.

The spelling of 18280381184520 in words is "eighteen trillion, two hundred eighty billion, three hundred eighty-one million, one hundred eighty-four thousand, five hundred twenty".