111998055680 has 432 divisors, whose sum is σ = 323021986560. Its totient is φ = 36439130112.

The previous prime is 111998055677. The next prime is 111998055683. The reversal of 111998055680 is 86550899111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111998055677) and next prime (111998055683).

It is a super-2 number, since 2×111998055680² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111998055683) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 670646957 + ... + 670647123.

It is an arithmetic number, because the mean of its divisors is an integer number (747736080).

Almost surely, 2^111998055680 is an apocalyptic number.

111998055680 is a gapful number since it is divisible by the number (10) 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 111998055680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161510993280).

111998055680 is an abundant number, since it is smaller than the sum of its proper divisors (211023930880).

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

111998055680 is an equidigital number, since it uses as much as digits as its factorization.

111998055680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 53.

The spelling of 111998055680 in words is "one hundred eleven billion, nine hundred ninety-eight million, fifty-five thousand, six hundred eighty".