1987865858144 has 24 divisors (see below), whose sum is σ = 3944426750208. Its totient is φ = 986106683520.

The previous prime is 1987865858113. The next prime is 1987865858177. The reversal of 1987865858144 is 4418585687891.

It is a super-2 number, since 2×1987865858144² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244566047 + ... + 244574174.

It is an arithmetic number, because the mean of its divisors is an integer number (164351114592).

Almost surely, 2^{1987865858144} is an apocalyptic number.

It is an amenable number.

1987865858144 is a deficient number, since it is larger than the sum of its proper divisors (1956560892064).

1987865858144 is a wasteful number, since it uses less digits than its factorization.

1987865858144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489140358 (or 489140350 counting only the distinct ones).

The product of its digits is 619315200, while the sum is 74.

The spelling of 1987865858144 in words is "one trillion, nine hundred eighty-seven billion, eight hundred sixty-five million, eight hundred fifty-eight thousand, one hundred forty-four".