11661560616011 has 4 divisors (see below), whose sum is σ = 12347534769912. Its totient is φ = 10975586462112.

The previous prime is 11661560616001. The next prime is 11661560616031. The reversal of 11661560616011 is 11061606516611.

11661560616011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11661560616011 - 2³⁴ = 11644380746827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11661560616011.

It is not an unprimeable number, because it can be changed into a prime (11661560616001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342987076925 + ... + 342987076958.

It is an arithmetic number, because the mean of its divisors is an integer number (3086883692478).

Almost surely, 2^{11661560616011} is an apocalyptic number.

11661560616011 is a deficient number, since it is larger than the sum of its proper divisors (685974153901).

11661560616011 is an equidigital number, since it uses as much as digits as its factorization.

11661560616011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685974153900.

The product of its (nonzero) digits is 38880, while the sum is 41.

The spelling of 11661560616011 in words is "eleven trillion, six hundred sixty-one billion, five hundred sixty million, six hundred sixteen thousand, eleven".