11866666811 has 4 divisors (see below), whose sum is σ = 11908897224. Its totient is φ = 11824436400.

The previous prime is 11866666783. The next prime is 11866666813.

11866666811 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11866666811 - 2¹⁰ = 11866665787 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 11866666811.

It is not an unprimeable number, because it can be changed into a prime (11866666813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21114785 + ... + 21115346.

It is an arithmetic number, because the mean of its divisors is an integer number (2977224306).

Almost surely, 2^11866666811 is an apocalyptic number.

11866666811 is a deficient number, since it is larger than the sum of its proper divisors (42230413).

11866666811 is an equidigital number, since it uses as much as digits as its factorization.

11866666811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42230412.

The product of its digits is 497664, while the sum is 50.

The spelling of 11866666811 in words is "eleven billion, eight hundred sixty-six million, six hundred sixty-six thousand, eight hundred eleven".