18000043499988 has 576 divisors, whose sum is σ = 54458127360000. Its totient is φ = 4955367352320.

The previous prime is 18000043499983. The next prime is 18000043499989. The reversal of 18000043499988 is 88999434000081.

18000043499988 is a `hidden beast` number, since 18 + 0 + 0 + 0 + 0 + 43 + 499 + 98 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000043499983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 9004523013 + ... + 9004525011.

It is an arithmetic number, because the mean of its divisors is an integer number (94545360000).

Almost surely, 2^{18000043499988} is an apocalyptic number.

18000043499988 is a gapful number since it is divisible by the number (18) 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 18000043499988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27229063680000).

18000043499988 is an abundant number, since it is smaller than the sum of its proper divisors (36458083860012).

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

18000043499988 is a wasteful number, since it uses less digits than its factorization.

18000043499988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2612 (or 2607 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 63.

The spelling of 18000043499988 in words is "eighteen trillion, forty-three million, four hundred ninety-nine thousand, nine hundred eighty-eight".