663633 has 12 divisors (see below), whose sum is σ = 994448. Its totient is φ = 442260.

The previous prime is 663631. The next prime is 663653. The reversal of 663633 is 336366.

It is not a de Polignac number, because 663633 - 2¹ = 663631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 663597 and 663606.

It is not an unprimeable number, because it can be changed into a prime (663631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1123 + ... + 1608.

2⁶⁶³⁶³³ is an apocalyptic number.

It is an amenable number.

663633 is a deficient number, since it is larger than the sum of its proper divisors (330815).

663633 is an equidigital number, since it uses as much as digits as its factorization.

663633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746 (or 2734 counting only the distinct ones).

The product of its digits is 5832, while the sum is 27.

The square root of 663633 is about 814.6367288553. The cubic root of 663633 is about 87.2253373752.

Adding to 663633 its reverse (336366), we get a palindrome (999999).

It can be divided in two parts, 66363 and 3, that added together give a palindrome (66366).

The spelling of 663633 in words is "six hundred sixty-three thousand, six hundred thirty-three".