1988732138544 has 200 divisors, whose sum is σ = 5849632586160. Its totient is φ = 652149729792.

The previous prime is 1988732138521. The next prime is 1988732138593. The reversal of 1988732138544 is 4458312378891.

1988732138544 is a `hidden beast` number, since 1 + 9 + 8 + 8 + 73 + 2 + 13 + 8 + 544 = 666.

It is a super-2 number, since 2×1988732138544² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 67106322 + ... + 67135950.

Almost surely, 2^{1988732138544} 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 1988732138544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2924816293080).

1988732138544 is an abundant number, since it is smaller than the sum of its proper divisors (3860900447616).

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

1988732138544 is a wasteful number, since it uses less digits than its factorization.

1988732138544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30489 (or 30474 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 63.

The spelling of 1988732138544 in words is "one trillion, nine hundred eighty-eight billion, seven hundred thirty-two million, one hundred thirty-eight thousand, five hundred forty-four".