18238297724640 has 1920 divisors, whose sum is σ = 79021213286400. Its totient is φ = 3869163417600.

The previous prime is 18238297724623. The next prime is 18238297724683. The reversal of 18238297724640 is 4642779283281.

It is a happy number.

18238297724640 is a `hidden beast` number, since 1 + 8 + 2 + 3 + 82 + 97 + 7 + 2 + 464 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 20561778277 + ... + 20561779163.

It is an arithmetic number, because the mean of its divisors is an integer number (41156881920).

Almost surely, 2^{18238297724640} is an apocalyptic number.

18238297724640 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 18238297724640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39510606643200).

18238297724640 is an abundant number, since it is smaller than the sum of its proper divisors (60782915561760).

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

18238297724640 is a wasteful number, since it uses less digits than its factorization.

18238297724640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170 (or 1153 counting only the distinct ones).

The product of its (nonzero) digits is 65028096, while the sum is 63.

The spelling of 18238297724640 in words is "eighteen trillion, two hundred thirty-eight billion, two hundred ninety-seven million, seven hundred twenty-four thousand, six hundred forty".