11561766687 has 32 divisors (see below), whose sum is σ = 17393745600. Its totient is φ = 7589320704.

The previous prime is 11561766679. The next prime is 11561766709. The reversal of 11561766687 is 78666716511.

11561766687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11561766687 - 2³ = 11561766679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561766607) 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 31 ways as a sum of consecutive naturals, for example, 504739 + ... + 527147.

It is an arithmetic number, because the mean of its divisors is an integer number (543554550).

Almost surely, 2^11561766687 is an apocalyptic number.

11561766687 is a deficient number, since it is larger than the sum of its proper divisors (5831978913).

11561766687 is a wasteful number, since it uses less digits than its factorization.

11561766687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22712 (or 22706 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The spelling of 11561766687 in words is "eleven billion, five hundred sixty-one million, seven hundred sixty-six thousand, six hundred eighty-seven".