11571197112 has 64 divisors (see below), whose sum is σ = 32225076000. Its totient is φ = 3847122432.

The previous prime is 11571197111. The next prime is 11571197227. The reversal of 11571197112 is 21179117511.

11571197112 is a `hidden beast` number, since 1 + 1 + 571 + 1 + 9 + 71 + 12 = 666.

11571197112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11571197111) by changing a digit.

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, 15168 + ... + 152880.

Almost surely, 2^11571197112 is an apocalyptic number.

11571197112 is a gapful number since it is divisible by the number (12) 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 11571197112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16112538000).

11571197112 is an abundant number, since it is smaller than the sum of its proper divisors (20653878888).

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

11571197112 is a wasteful number, since it uses less digits than its factorization.

11571197112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138117 (or 138107 counting only the distinct ones).

The product of its digits is 4410, while the sum is 36.

The spelling of 11571197112 in words is "eleven billion, five hundred seventy-one million, one hundred ninety-seven thousand, one hundred twelve".