11831393556 has 72 divisors (see below), whose sum is σ = 31670009280. Its totient is φ = 3713821056.

The previous prime is 11831393551. The next prime is 11831393599. The reversal of 11831393556 is 65539313811.

11831393556 is a `hidden beast` number, since 1 + 1 + 8 + 3 + 1 + 3 + 93 + 556 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11831393551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62440 + ... + 166016.

It is an arithmetic number, because the mean of its divisors is an integer number (439861240).

Almost surely, 2^11831393556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11831393556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15835004640).

11831393556 is an abundant number, since it is smaller than the sum of its proper divisors (19838615724).

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

11831393556 is a wasteful number, since it uses less digits than its factorization.

11831393556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103773 (or 103768 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The spelling of 11831393556 in words is "eleven billion, eight hundred thirty-one million, three hundred ninety-three thousand, five hundred fifty-six".