11663 has 4 divisors (see below), whose sum is σ = 11880. Its totient is φ = 11448.

The previous prime is 11657. The next prime is 11677. The reversal of 11663 is 36611.

It is a Cunningham number, because it is equal to 108²-1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 36611 = 31 ⋅1181.

It is a cyclic number.

It is not a de Polignac number, because 11663 - 2¹⁰ = 10639 is a prime.

It is a Duffinian number.

It is a plaindrome in base 6, base 9 and base 12.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11633) 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, 53 + ... + 161.

It is an arithmetic number, because the mean of its divisors is an integer number (2970).

11663 is a Friedman number, since it can be written as 16*3^6-1, using all its digits and the basic arithmetic operations.

2¹¹⁶⁶³ is an apocalyptic number.

11663 is a deficient number, since it is larger than the sum of its proper divisors (217).

11663 is a wasteful number, since it uses less digits than its factorization.

11663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216.

The product of its digits is 108, while the sum is 17.

The square root of 11663 is about 107.9953702711. The cubic root of 11663 is about 22.6779307720.

The spelling of 11663 in words is "eleven thousand, six hundred sixty-three".