18987943138560 has 576 divisors, whose sum is σ = 77830285397760. Its totient is φ = 4332363448320.

The previous prime is 18987943138553. The next prime is 18987943138573. The reversal of 18987943138560 is 6583134978981.

18987943138560 is a `hidden beast` number, since 1 + 8 + 9 + 8 + 7 + 9 + 43 + 13 + 8 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4993684 + ... + 7931756.

It is an arithmetic number, because the mean of its divisors is an integer number (135122023260).

Almost surely, 2^{18987943138560} is an apocalyptic number.

18987943138560 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 18987943138560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38915142698880).

18987943138560 is an abundant number, since it is smaller than the sum of its proper divisors (58842342259200).

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

18987943138560 is a wasteful number, since it uses less digits than its factorization.

18987943138560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2938131 (or 2938111 counting only the distinct ones).

The product of its (nonzero) digits is 313528320, while the sum is 72.

The spelling of 18987943138560 in words is "eighteen trillion, nine hundred eighty-seven billion, nine hundred forty-three million, one hundred thirty-eight thousand, five hundred sixty".