111521666400 has 144 divisors (see below), whose sum is σ = 363220127424. Its totient is φ = 29721326080.

The previous prime is 111521666393. The next prime is 111521666423. The reversal of 111521666400 is 4666125111.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4275799 + ... + 4301801.

It is an arithmetic number, because the mean of its divisors is an integer number (2522361996).

Almost surely, 2^111521666400 is an apocalyptic number.

111521666400 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 111521666400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181610063712).

111521666400 is an abundant number, since it is smaller than the sum of its proper divisors (251698461024).

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

111521666400 is a wasteful number, since it uses less digits than its factorization.

111521666400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27813 (or 27800 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The spelling of 111521666400 in words is "one hundred eleven billion, five hundred twenty-one million, six hundred sixty-six thousand, four hundred".