111784231638 has 24 divisors (see below), whose sum is σ = 246768966288. Its totient is φ = 36558364752.

The previous prime is 111784231631. The next prime is 111784231649. The reversal of 111784231638 is 836132487111.

111784231638 is a `hidden beast` number, since 1 + 1 + 1 + 7 + 8 + 4 + 2 + 3 + 1 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 111784231593 and 111784231602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111784231631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58586170 + ... + 58588077.

It is an arithmetic number, because the mean of its divisors is an integer number (10282040262).

Almost surely, 2^111784231638 is an apocalyptic number.

111784231638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

111784231638 is an abundant number, since it is smaller than the sum of its proper divisors (134984734650).

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

111784231638 is a wasteful number, since it uses less digits than its factorization.

111784231638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117174308 (or 117174305 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The spelling of 111784231638 in words is "one hundred eleven billion, seven hundred eighty-four million, two hundred thirty-one thousand, six hundred thirty-eight".