111643969920 has 256 divisors, whose sum is σ = 408105492480. Its totient is φ = 25430630400.

The previous prime is 111643969919. The next prime is 111643970027. The reversal of 111643969920 is 29969346111.

111643969920 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3923745 + ... + 3952095.

It is an arithmetic number, because the mean of its divisors is an integer number (1594162080).

Almost surely, 2^111643969920 is an apocalyptic number.

111643969920 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 111643969920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204052746240).

111643969920 is an abundant number, since it is smaller than the sum of its proper divisors (296461522560).

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

111643969920 is a wasteful number, since it uses less digits than its factorization.

111643969920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28673 (or 28661 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 51.

The spelling of 111643969920 in words is "one hundred eleven billion, six hundred forty-three million, nine hundred sixty-nine thousand, nine hundred twenty".