11663656661 has 16 divisors (see below), whose sum is σ = 12292452480. Its totient is φ = 11045453760.

The previous prime is 11663656637. The next prime is 11663656703. The reversal of 11663656661 is 16665636611.

It is not a de Polignac number, because 11663656661 - 2¹⁰ = 11663655637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11663656601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1187591 + ... + 1197371.

It is an arithmetic number, because the mean of its divisors is an integer number (768278280).

Almost surely, 2^11663656661 is an apocalyptic number.

It is an amenable number.

11663656661 is a deficient number, since it is larger than the sum of its proper divisors (628795819).

11663656661 is a wasteful number, since it uses less digits than its factorization.

11663656661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10316.

The product of its digits is 699840, while the sum is 47.

The spelling of 11663656661 in words is "eleven billion, six hundred sixty-three million, six hundred fifty-six thousand, six hundred sixty-one".