18081584240 has 40 divisors (see below), whose sum is σ = 42107714160. Its totient is φ = 7220929536.

The previous prime is 18081584239. The next prime is 18081584249. The reversal of 18081584240 is 4248518081.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081584249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133049 + ... + 232088.

It is an arithmetic number, because the mean of its divisors is an integer number (1052692854).

Almost surely, 2^18081584240 is an apocalyptic number.

18081584240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18081584240 is an abundant number, since it is smaller than the sum of its proper divisors (24026129920).

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

18081584240 is a wasteful number, since it uses less digits than its factorization.

18081584240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365769 (or 365763 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 41.

The spelling of 18081584240 in words is "eighteen billion, eighty-one million, five hundred eighty-four thousand, two hundred forty".