111161120556 has 12 divisors (see below), whose sum is σ = 259375947992. Its totient is φ = 37053706848.

The previous prime is 111161120537. The next prime is 111161120579. The reversal of 111161120556 is 655021161111.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4631713345 + ... + 4631713368.

Almost surely, 2^111161120556 is an apocalyptic number.

It is an amenable number.

111161120556 is an abundant number, since it is smaller than the sum of its proper divisors (148214827436).

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

111161120556 is a wasteful number, since it uses less digits than its factorization.

111161120556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9263426720 (or 9263426718 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 30.

Adding to 111161120556 its reverse (655021161111), we get a palindrome (766182281667).

The spelling of 111161120556 in words is "one hundred eleven billion, one hundred sixty-one million, one hundred twenty thousand, five hundred fifty-six".