111660890550 has 96 divisors (see below), whose sum is σ = 304121606400. Its totient is φ = 26887574400.

The previous prime is 111660890527. The next prime is 111660890587. The reversal of 111660890550 is 55098066111.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18759 + ... + 472941.

It is an arithmetic number, because the mean of its divisors is an integer number (3167933400).

Almost surely, 2^111660890550 is an apocalyptic number.

111660890550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 111660890550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152060803200).

111660890550 is an abundant number, since it is smaller than the sum of its proper divisors (192460715850).

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

111660890550 is a wasteful number, since it uses less digits than its factorization.

111660890550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454358 (or 454353 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 42.

The spelling of 111660890550 in words is "one hundred eleven billion, six hundred sixty million, eight hundred ninety thousand, five hundred fifty".