11556660665 has 8 divisors (see below), whose sum is σ = 15128719488. Its totient is φ = 8404844080.

The previous prime is 11556660649. The next prime is 11556660671. The reversal of 11556660665 is 56606665511.

11556660665 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 not a de Polignac number, because 11556660665 - 2⁴ = 11556660649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 105060497 + ... + 105060606.

It is an arithmetic number, because the mean of its divisors is an integer number (1891089936).

Almost surely, 2^11556660665 is an apocalyptic number.

It is an amenable number.

11556660665 is a deficient number, since it is larger than the sum of its proper divisors (3572058823).

11556660665 is a wasteful number, since it uses less digits than its factorization.

11556660665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210121119.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 11556660665 in words is "eleven billion, five hundred fifty-six million, six hundred sixty thousand, six hundred sixty-five".