11571818112 has 160 divisors (see below), whose sum is σ = 35171737920. Its totient is φ = 3775044096.

The previous prime is 11571818081. The next prime is 11571818171. The reversal of 11571818112 is 21181817511.

11571818112 is a `hidden beast` number, since 1 + 1 + 571 + 8 + 1 + 81 + 1 + 2 = 666.

It is a super-2 number, since 2×11571818112² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 475423 + ... + 499169.

It is an arithmetic number, because the mean of its divisors is an integer number (219823362).

Almost surely, 2^11571818112 is an apocalyptic number.

11571818112 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 11571818112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17585868960).

11571818112 is an abundant number, since it is smaller than the sum of its proper divisors (23599919808).

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

11571818112 is an equidigital number, since it uses as much as digits as its factorization.

11571818112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23820 (or 23799 counting only the distinct ones).

The product of its digits is 4480, while the sum is 36.

The spelling of 11571818112 in words is "eleven billion, five hundred seventy-one million, eight hundred eighteen thousand, one hundred twelve".