663535 has 4 divisors (see below), whose sum is σ = 796248. Its totient is φ = 530824.

The previous prime is 663529. The next prime is 663539. The reversal of 663535 is 535366.

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

It is a cyclic number.

It is not a de Polignac number, because 663535 - 2⁷ = 663407 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663539) 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, 66349 + ... + 66358.

It is an arithmetic number, because the mean of its divisors is an integer number (199062).

2⁶⁶³⁵³⁵ is an apocalyptic number.

663535 is a deficient number, since it is larger than the sum of its proper divisors (132713).

663535 is a wasteful number, since it uses less digits than its factorization.

663535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132712.

The product of its digits is 8100, while the sum is 28.

The square root of 663535 is about 814.5765771246. The cubic root of 663535 is about 87.2210435844.

It can be divided in two parts, 6635 and 35, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 663535 in words is "six hundred sixty-three thousand, five hundred thirty-five".