18519321600000 has 2016 divisors, whose sum is σ = 75003741015840. Its totient is φ = 4538695680000.

The previous prime is 18519321599981. The next prime is 18519321600007. The reversal of 18519321600000 is 612391581.

18519321600000 is a `hidden beast` number, since 1 + 8 + 5 + 19 + 32 + 1 + 600 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18519321600007) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 80870399886 + ... + 80870400114.

It is an arithmetic number, because the mean of its divisors is an integer number (37204236615).

Almost surely, 2^{18519321600000} is an apocalyptic number.

18519321600000 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 18519321600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37501870507920).

18519321600000 is an abundant number, since it is smaller than the sum of its proper divisors (56484419415840).

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

18519321600000 is an frugal number, since it uses more digits than its factorization.

18519321600000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

Adding to 18519321600000 its reverse (612391581), we get a palindrome (18519933991581).

The spelling of 18519321600000 in words is "eighteen trillion, five hundred nineteen billion, three hundred twenty-one million, six hundred thousand".