11665806666 has 16 divisors (see below), whose sum is σ = 23334081888. Its totient is φ = 3888190800.

The previous prime is 11665806643. The next prime is 11665806673. The reversal of 11665806666 is 66660856611.

11665806666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 38305 + ... + 157476.

It is an arithmetic number, because the mean of its divisors is an integer number (1458380118).

Almost surely, 2^11665806666 is an apocalyptic number.

11665806666 is an abundant number, since it is smaller than the sum of its proper divisors (11668275222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11665806666 is a wasteful number, since it uses less digits than its factorization.

11665806666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205717.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 11665806666 in words is "eleven billion, six hundred sixty-five million, eight hundred six thousand, six hundred sixty-six".