11566665605 has 16 divisors (see below), whose sum is σ = 15143912064. Its totient is φ = 8410956480.

The previous prime is 11566665599. The next prime is 11566665613. The reversal of 11566665605 is 50656666511.

It is not a de Polignac number, because 11566665605 - 2¹⁰ = 11566664581 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 11566665605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 727319 + ... + 743051.

It is an arithmetic number, because the mean of its divisors is an integer number (946494504).

Almost surely, 2^11566665605 is an apocalyptic number.

It is an amenable number.

11566665605 is a deficient number, since it is larger than the sum of its proper divisors (3577246459).

11566665605 is a wasteful number, since it uses less digits than its factorization.

11566665605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29116.

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

The spelling of 11566665605 in words is "eleven billion, five hundred sixty-six million, six hundred sixty-five thousand, six hundred five".