1988732138543 has 4 divisors (see below), whose sum is σ = 1990239897360. Its totient is φ = 1987224379728.

The previous prime is 1988732138521. The next prime is 1988732138593. The reversal of 1988732138543 is 3458312378891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1988732138543 - 2¹² = 1988732134447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988732138593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753877430 + ... + 753880067.

It is an arithmetic number, because the mean of its divisors is an integer number (497559974340).

Almost surely, 2^{1988732138543} is an apocalyptic number.

1988732138543 is a deficient number, since it is larger than the sum of its proper divisors (1507758817).

1988732138543 is a wasteful number, since it uses less digits than its factorization.

1988732138543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507758816.

The product of its digits is 34836480, while the sum is 62.

The spelling of 1988732138543 in words is "one trillion, nine hundred eighty-eight billion, seven hundred thirty-two million, one hundred thirty-eight thousand, five hundred forty-three".