663523 has 4 divisors (see below), whose sum is σ = 758320. Its totient is φ = 568728.

The previous prime is 663517. The next prime is 663529. The reversal of 663523 is 325366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325366 = 2 ⋅162683.

It is an interprime number because it is at equal distance from previous prime (663517) and next prime (663529).

It is a cyclic number.

It is not a de Polignac number, because 663523 - 2¹³ = 655331 is a prime.

It is a d-powerful number, because it can be written as 6² + 6⁴ + 5⁷ + 3⁶ + 2¹⁹ + 3¹⁰ .

It is a Duffinian number.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (663529) 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, 47388 + ... + 47401.

It is an arithmetic number, because the mean of its divisors is an integer number (189580).

2⁶⁶³⁵²³ is an apocalyptic number.

663523 is a deficient number, since it is larger than the sum of its proper divisors (94797).

663523 is an equidigital number, since it uses as much as digits as its factorization.

663523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94796.

The product of its digits is 3240, while the sum is 25.

The square root of 663523 is about 814.5692113013. The cubic root of 663523 is about 87.2205177850.

Adding to 663523 its reverse (325366), we get a palindrome (988889).

The spelling of 663523 in words is "six hundred sixty-three thousand, five hundred twenty-three".