18805332131240 has 128 divisors (see below), whose sum is σ = 45548191188000. Its totient is φ = 6962511052800.

The previous prime is 18805332131213. The next prime is 18805332131249. The reversal of 18805332131240 is 4213123350881.

It can be written as a sum of positive squares in 16 ways, for example, as 8191719445924 + 10613612685316 = 2862118^2 + 3257854^2 .

It is not an unprimeable number, because it can be changed into a prime (18805332131249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9314492 + ... + 11152148.

Almost surely, 2^{18805332131240} is an apocalyptic number.

18805332131240 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 18805332131240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22774095594000).

18805332131240 is an abundant number, since it is smaller than the sum of its proper divisors (26742859056760).

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

18805332131240 is a wasteful number, since it uses less digits than its factorization.

18805332131240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837935 (or 1837931 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 18805332131240 in words is "eighteen trillion, eight hundred five billion, three hundred thirty-two million, one hundred thirty-one thousand, two hundred forty".