1987142940864 has 168 divisors, whose sum is σ = 5959126268160. Its totient is φ = 631908490752.

The previous prime is 1987142940847. The next prime is 1987142940869. The reversal of 1987142940864 is 4680492417891.

1987142940864 is a `hidden beast` number, since 1 + 9 + 87 + 142 + 9 + 408 + 6 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (1987142940869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4823109 + ... + 5218875.

Almost surely, 2^{1987142940864} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1987142940864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2979563134080).

1987142940864 is an abundant number, since it is smaller than the sum of its proper divisors (3971983327296).

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

1987142940864 is a wasteful number, since it uses less digits than its factorization.

1987142940864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396187 (or 396174 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 1987142940864 in words is "one trillion, nine hundred eighty-seven billion, one hundred forty-two million, nine hundred forty thousand, eight hundred sixty-four".