663505 has 4 divisors (see below), whose sum is σ = 796212. Its totient is φ = 530800.

The previous prime is 663463. The next prime is 663517. The reversal of 663505 is 505366.

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

It can be written as a sum of positive squares in 2 ways, for example, as 358801 + 304704 = 599^2 + 552^2 .

It is not a de Polignac number, because 663505 - 2¹⁵ = 630737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 663505.

It is an unprimeable number.

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, 66346 + ... + 66355.

It is an arithmetic number, because the mean of its divisors is an integer number (199053).

2⁶⁶³⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

663505 is a deficient number, since it is larger than the sum of its proper divisors (132707).

663505 is a wasteful number, since it uses less digits than its factorization.

663505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132706.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 663505 is about 814.5581624415. The cubic root of 663505 is about 87.2197290741.

The spelling of 663505 in words is "six hundred sixty-three thousand, five hundred five".