111638013543 has 36 divisors (see below), whose sum is σ = 188824619568. Its totient is φ = 63370641600.

The previous prime is 111638013511. The next prime is 111638013559. The reversal of 111638013543 is 345310836111.

111638013543 is a `hidden beast` number, since 1 + 1 + 1 + 638 + 0 + 13 + 5 + 4 + 3 = 666.

It is not a de Polignac number, because 111638013543 - 2⁵ = 111638013511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111638013498 and 111638013507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111638013593) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 771646 + ... + 904827.

Almost surely, 2^111638013543 is an apocalyptic number.

111638013543 is a deficient number, since it is larger than the sum of its proper divisors (77186606025).

111638013543 is a wasteful number, since it uses less digits than its factorization.

111638013543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676644 (or 1676634 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

Adding to 111638013543 its reverse (345310836111), we get a palindrome (456948849654).

The spelling of 111638013543 in words is "one hundred eleven billion, six hundred thirty-eight million, thirteen thousand, five hundred forty-three".