520663 has 12 divisors (see below), whose sum is σ = 618184. Its totient is φ = 435600.

The previous prime is 520649. The next prime is 520679. The reversal of 520663 is 366025.

It is not a de Polignac number, because 520663 - 2⁵ = 520631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520633) 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, 1408 + ... + 1738.

2⁵²⁰⁶⁶³ is an apocalyptic number.

520663 is a deficient number, since it is larger than the sum of its proper divisors (97521).

520663 is a wasteful number, since it uses less digits than its factorization.

520663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 520663 is about 721.5698164419. The cubic root of 520663 is about 80.4486768261.

Adding to 520663 its reverse (366025), we get a palindrome (886688).

The spelling of 520663 in words is "five hundred twenty thousand, six hundred sixty-three".