5663 has 4 divisors (see below), whose sum is σ = 6480. Its totient is φ = 4848.

The previous prime is 5659. The next prime is 5669. The reversal of 5663 is 3665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3665 = 5 ⋅733.

It is a cyclic number.

It is not a de Polignac number, because 5663 - 2² = 5659 is a prime.

It is an Ulam number.

It is a Duffinian number.

5663 is a modest number, since divided by 63 gives 56 as remainder.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5669) 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, 398 + ... + 411.

It is an arithmetic number, because the mean of its divisors is an integer number (1620).

2⁵⁶⁶³ is an apocalyptic number.

5663 is a deficient number, since it is larger than the sum of its proper divisors (817).

5663 is an equidigital number, since it uses as much as digits as its factorization.

5663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816.

The product of its digits is 540, while the sum is 20.

The square root of 5663 is about 75.2529069206. The cubic root of 5663 is about 17.8244246611.

The spelling of 5663 in words is "five thousand, six hundred sixty-three".