11111112543 has 48 divisors (see below), whose sum is σ = 16191781760. Its totient is φ = 6753689280.

The previous prime is 11111112521. The next prime is 11111112559. The reversal of 11111112543 is 34521111111.

It is not a de Polignac number, because 11111112543 - 2¹⁴ = 11111096159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111112583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36192396 + ... + 36192702.

Almost surely, 2^11111112543 is an apocalyptic number.

11111112543 is a deficient number, since it is larger than the sum of its proper divisors (5080669217).

11111112543 is a wasteful number, since it uses less digits than its factorization.

11111112543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628 (or 497 counting only the distinct ones).

The product of its digits is 120, while the sum is 21.

Adding to 11111112543 its reverse (34521111111), we get a palindrome (45632223654).

The spelling of 11111112543 in words is "eleven billion, one hundred eleven million, one hundred twelve thousand, five hundred forty-three".