63663 has 4 divisors (see below), whose sum is σ = 84888. Its totient is φ = 42440.

The previous prime is 63659. The next prime is 63667. The reversal of 63663 is 36636.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (63659) and next prime (63667).

It is a cyclic number.

It is not a de Polignac number, because 63663 - 2² = 63659 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10608 + ... + 10613.

It is an arithmetic number, because the mean of its divisors is an integer number (21222).

2⁶³⁶⁶³ is an apocalyptic number.

63663 is a deficient number, since it is larger than the sum of its proper divisors (21225).

63663 is a wasteful number, since it uses less digits than its factorization.

63663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21224.

The product of its digits is 1944, while the sum is 24.

The square root of 63663 is about 252.3152789666. The cubic root of 63663 is about 39.9296680747.

The spelling of 63663 in words is "sixty-three thousand, six hundred sixty-three".