111660323172 has 12 divisors (see below), whose sum is σ = 260540754096. Its totient is φ = 37220107720.

The previous prime is 111660323171. The next prime is 111660323221. The reversal of 111660323172 is 271323066111.

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

It is not an unprimeable number, because it can be changed into a prime (111660323171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4652513454 + ... + 4652513477.

It is an arithmetic number, because the mean of its divisors is an integer number (21711729508).

Almost surely, 2^111660323172 is an apocalyptic number.

111660323172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111660323172 is an abundant number, since it is smaller than the sum of its proper divisors (148880430924).

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

111660323172 is a wasteful number, since it uses less digits than its factorization.

111660323172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9305026938 (or 9305026936 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

Adding to 111660323172 its reverse (271323066111), we get a palindrome (382983389283).

The spelling of 111660323172 in words is "one hundred eleven billion, six hundred sixty million, three hundred twenty-three thousand, one hundred seventy-two".