111561326280 has 384 divisors, whose sum is σ = 376532582400. Its totient is φ = 28630941696.

The previous prime is 111561326257. The next prime is 111561326293. The reversal of 111561326280 is 82623165111.

111561326280 is a `hidden beast` number, since 1 + 1 + 1 + 56 + 1 + 326 + 280 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 414725986 + ... + 414726254.

It is an arithmetic number, because the mean of its divisors is an integer number (980553600).

Almost surely, 2^111561326280 is an apocalyptic number.

111561326280 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 111561326280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188266291200).

111561326280 is an abundant number, since it is smaller than the sum of its proper divisors (264971256120).

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

111561326280 is a wasteful number, since it uses less digits than its factorization.

111561326280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 111561326280 in words is "one hundred eleven billion, five hundred sixty-one million, three hundred twenty-six thousand, two hundred eighty".