111801041820 has 288 divisors, whose sum is σ = 380908469760. Its totient is φ = 26356285440.

The previous prime is 111801041801. The next prime is 111801041843. The reversal of 111801041820 is 28140108111.

It is a congruent number.

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, 7028436 + ... + 7044324.

Almost surely, 2^111801041820 is an apocalyptic number.

111801041820 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 111801041820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190454234880).

111801041820 is an abundant number, since it is smaller than the sum of its proper divisors (269107427940).

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

111801041820 is a wasteful number, since it uses less digits than its factorization.

111801041820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16045 (or 16040 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 27.

Adding to 111801041820 its reverse (28140108111), we get a palindrome (139941149931).

The spelling of 111801041820 in words is "one hundred eleven billion, eight hundred one million, forty-one thousand, eight hundred twenty".