11566510661 has 8 divisors (see below), whose sum is σ = 12195817920. Its totient is φ = 10939257792.

The previous prime is 11566510603. The next prime is 11566510679. The reversal of 11566510661 is 16601566511.

11566510661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11566510661 - 2¹⁰ = 11566509637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11566510601) 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 7 ways as a sum of consecutive naturals, for example, 502025 + ... + 524558.

It is an arithmetic number, because the mean of its divisors is an integer number (1524477240).

Almost surely, 2^11566510661 is an apocalyptic number.

It is an amenable number.

11566510661 is a deficient number, since it is larger than the sum of its proper divisors (629307259).

11566510661 is a wasteful number, since it uses less digits than its factorization.

11566510661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027195.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 11566510661 in words is "eleven billion, five hundred sixty-six million, five hundred ten thousand, six hundred sixty-one".