11665733206666 has 16 divisors (see below), whose sum is σ = 21816436127040. Its totient is φ = 4545090859680.

The previous prime is 11665733206663. The next prime is 11665733206669. The reversal of 11665733206666 is 66660233756611.

It is an interprime number because it is at equal distance from previous prime (11665733206663) and next prime (11665733206669).

It is a self number, because there is not a number n which added to its sum of digits gives 11665733206666.

It is not an unprimeable number, because it can be changed into a prime (11665733206663) 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, 37875757011 + ... + 37875757318.

It is an arithmetic number, because the mean of its divisors is an integer number (1363527257940).

Almost surely, 2^{11665733206666} is an apocalyptic number.

11665733206666 is a deficient number, since it is larger than the sum of its proper divisors (10150702920374).

11665733206666 is a wasteful number, since it uses less digits than its factorization.

11665733206666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75751514349.

The product of its (nonzero) digits is 29393280, while the sum is 58.

Subtracting 11665733206666 from its reverse (66660233756611), we obtain a palindrome (54994500549945).

The spelling of 11665733206666 in words is "eleven trillion, six hundred sixty-five billion, seven hundred thirty-three million, two hundred six thousand, six hundred sixty-six".