111556551912 has 256 divisors, whose sum is σ = 309904896000. Its totient is φ = 33256396800.

The previous prime is 111556551907. The next prime is 111556551943. The reversal of 111556551912 is 219155655111.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 560585589 + ... + 560585787.

It is an arithmetic number, because the mean of its divisors is an integer number (1210566000).

Almost surely, 2^111556551912 is an apocalyptic number.

111556551912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111556551912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154952448000).

111556551912 is an abundant number, since it is smaller than the sum of its proper divisors (198348344088).

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

111556551912 is a wasteful number, since it uses less digits than its factorization.

111556551912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608 (or 604 counting only the distinct ones).

The product of its digits is 67500, while the sum is 42.

The spelling of 111556551912 in words is "one hundred eleven billion, five hundred fifty-six million, five hundred fifty-one thousand, nine hundred twelve".