11661216611 has 12 divisors (see below), whose sum is σ = 12820320072. Its totient is φ = 10598940000.

The previous prime is 11661216599. The next prime is 11661216613.

11661216611 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-11661216611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11661216613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1094711 + ... + 1105311.

It is an arithmetic number, because the mean of its divisors is an integer number (1068360006).

Almost surely, 2^11661216611 is an apocalyptic number.

11661216611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11661216611 is a deficient number, since it is larger than the sum of its proper divisors (1159103461).

11661216611 is a wasteful number, since it uses less digits than its factorization.

11661216611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19714 (or 19703 counting only the distinct ones).

The product of its digits is 2592, while the sum is 32.

The spelling of 11661216611 in words is "eleven billion, six hundred sixty-one million, two hundred sixteen thousand, six hundred eleven".