111543431552 has 64 divisors (see below), whose sum is σ = 254653232640. Its totient is φ = 47673930240.

The previous prime is 111543431501. The next prime is 111543431621. The reversal of 111543431552 is 255134345111.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159227 + ... + 498437.

It is an arithmetic number, because the mean of its divisors is an integer number (3978956760).

Almost surely, 2^111543431552 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 111543431552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127326616320).

111543431552 is an abundant number, since it is smaller than the sum of its proper divisors (143109801088).

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

111543431552 is an equidigital number, since it uses as much as digits as its factorization.

111543431552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339599 (or 339587 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

Adding to 111543431552 its reverse (255134345111), we get a palindrome (366677776663).

The spelling of 111543431552 in words is "one hundred eleven billion, five hundred forty-three million, four hundred thirty-one thousand, five hundred fifty-two".