18987936552487 has 16 divisors (see below), whose sum is σ = 22071483072000. Its totient is φ = 15997215549600.

The previous prime is 18987936552451. The next prime is 18987936552503. The reversal of 18987936552487 is 78425563978981.

It is a cyclic number.

It is not a de Polignac number, because 18987936552487 - 2⁷ = 18987936552359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18987936552487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18987936552787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438139 + ... + 6178012.

It is an arithmetic number, because the mean of its divisors is an integer number (1379467692000).

Almost surely, 2^{18987936552487} is an apocalyptic number.

18987936552487 is a deficient number, since it is larger than the sum of its proper divisors (3083546519513).

18987936552487 is an equidigital number, since it uses as much as digits as its factorization.

18987936552487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6623166.

The product of its digits is 7315660800, while the sum is 82.

The spelling of 18987936552487 in words is "eighteen trillion, nine hundred eighty-seven billion, nine hundred thirty-six million, five hundred fifty-two thousand, four hundred eighty-seven".