11656515666 has 16 divisors (see below), whose sum is σ = 23316489504. Its totient is φ = 3884928864.

The previous prime is 11656515653. The next prime is 11656515707. The reversal of 11656515666 is 66651565611.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99195 + ... + 182078.

It is an arithmetic number, because the mean of its divisors is an integer number (1457280594).

Almost surely, 2^11656515666 is an apocalyptic number.

11656515666 is an abundant number, since it is smaller than the sum of its proper divisors (11659973838).

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

11656515666 is a wasteful number, since it uses less digits than its factorization.

11656515666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288185.

The product of its digits is 972000, while the sum is 48.

It can be divided in two parts, 116565 and 15666, that added together give a palindrome (132231).

The spelling of 11656515666 in words is "eleven billion, six hundred fifty-six million, five hundred fifteen thousand, six hundred sixty-six".