11665015566 has 16 divisors (see below), whose sum is σ = 23336489424. Its totient is φ = 3887262144.

The previous prime is 11665015561. The next prime is 11665015573. The reversal of 11665015566 is 66551056611.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11665015561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245455 + ... + 289098.

It is an arithmetic number, because the mean of its divisors is an integer number (1458530589).

Almost surely, 2^11665015566 is an apocalyptic number.

11665015566 is an abundant number, since it is smaller than the sum of its proper divisors (11671473858).

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

11665015566 is a wasteful number, since it uses less digits than its factorization.

11665015566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538195.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 11665015566 in words is "eleven billion, six hundred sixty-five million, fifteen thousand, five hundred sixty-six".