18532561503720 has 768 divisors, whose sum is σ = 67617897984000. Its totient is φ = 4041319772160.

The previous prime is 18532561503707. The next prime is 18532561503721. The reversal of 18532561503720 is 2730516523581.

It is a self number, because there is not a number n which added to its sum of digits gives 18532561503720.

It is not an unprimeable number, because it can be changed into a prime (18532561503721) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 869287221 + ... + 869308539.

It is an arithmetic number, because the mean of its divisors is an integer number (88044138000).

Almost surely, 2^{18532561503720} is an apocalyptic number.

18532561503720 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 18532561503720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33808948992000).

18532561503720 is an abundant number, since it is smaller than the sum of its proper divisors (49085336480280).

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

18532561503720 is a wasteful number, since it uses less digits than its factorization.

18532561503720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21534 (or 21519 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 48.

The spelling of 18532561503720 in words is "eighteen trillion, five hundred thirty-two billion, five hundred sixty-one million, five hundred three thousand, seven hundred twenty".