63 is nontrivially palindromic in base 2, base 4 and base 8.
63 is an esthetic number in base 15, because in such base it adjacent digits differ by 1.
It is a d-powerful number, because it can be written as 33 + 62 .
It is a D-number.
It is an alternating number because its digits alternate between even and odd.
It is a Duffinian number.
63 is a lucky number.
63 is a nontrivial repdigit in base 2, base 4 and base 8.
It is a plaindrome in base 2, base 4, base 5, base 8, base 11, base 13, base 14 and base 16.
It is a nialpdrome in base 2, base 3, base 4, base 8, base 9, base 10, base 12 and base 15.
It is a zygodrome in base 2, base 4 and base 8.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 63.
Being equal to 4×24-1, it is a Woodall number.
63 is a wasteful number, since it uses less digits than its factorization.
63 is an evil number, because the sum of its binary digits is even.
The square root of 63 is about 7.9372539332. The cubic root of 63 is about 3.9790572079.