11665456611 has 4 divisors (see below), whose sum is σ = 15553942152. Its totient is φ = 7776971072.

The previous prime is 11665456601. The next prime is 11665456633.

11665456611 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 11665456611 - 2¹⁸ = 11665194467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11665456601) 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, 1944242766 + ... + 1944242771.

It is an arithmetic number, because the mean of its divisors is an integer number (3888485538).

Almost surely, 2^11665456611 is an apocalyptic number.

11665456611 is a deficient number, since it is larger than the sum of its proper divisors (3888485541).

11665456611 is an equidigital number, since it uses as much as digits as its factorization.

11665456611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888485540.

The product of its digits is 129600, while the sum is 42.

The spelling of 11665456611 in words is "eleven billion, six hundred sixty-five million, four hundred fifty-six thousand, six hundred eleven".