111423023440 has 80 divisors (see below), whose sum is σ = 270428191488. Its totient is φ = 42614663168.

The previous prime is 111423023423. The next prime is 111423023539. The reversal of 111423023440 is 44320324111.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5320029 + ... + 5340931.

Almost surely, 2^111423023440 is an apocalyptic number.

111423023440 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 111423023440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135214095744).

111423023440 is an abundant number, since it is smaller than the sum of its proper divisors (159005168048).

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

111423023440 is a wasteful number, since it uses less digits than its factorization.

111423023440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23836 (or 23830 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 111423023440 its reverse (44320324111), we get a palindrome (155743347551).

The spelling of 111423023440 in words is "one hundred eleven billion, four hundred twenty-three million, twenty-three thousand, four hundred forty".