11788131681 has 6 divisors (see below), whose sum is σ = 17027301330. Its totient is φ = 7858754448.

The previous prime is 11788131679. The next prime is 11788131749. The reversal of 11788131681 is 18613188711.

It is a happy number.

11788131681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11581203456 + 206928225 = 107616^2 + 14385^2 .

It is not a de Polignac number, because 11788131681 - 2¹ = 11788131679 is a prime.

It is a super-2 number, since 2×11788131681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11788131781) 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 5 ways as a sum of consecutive naturals, for example, 654896196 + ... + 654896213.

It is an arithmetic number, because the mean of its divisors is an integer number (2837883555).

Almost surely, 2^11788131681 is an apocalyptic number.

It is an amenable number.

11788131681 is a deficient number, since it is larger than the sum of its proper divisors (5239169649).

11788131681 is a wasteful number, since it uses less digits than its factorization.

11788131681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309792415 (or 1309792412 counting only the distinct ones).

The product of its digits is 64512, while the sum is 45.

The spelling of 11788131681 in words is "eleven billion, seven hundred eighty-eight million, one hundred thirty-one thousand, six hundred eighty-one".