65523 has 4 divisors (see below), whose sum is σ = 87368. Its totient is φ = 43680.

The previous prime is 65521. The next prime is 65537. The reversal of 65523 is 32556.

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

It is not a de Polignac number, because 65523 - 2¹ = 65521 is a prime.

It is a d-powerful number, because it can be written as 6³ + 5⁵ + 5⁵ + 2³ + 3¹⁰ .

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 65523.

It is not an unprimeable number, because it can be changed into a prime (65521) 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, 10918 + ... + 10923.

It is an arithmetic number, because the mean of its divisors is an integer number (21842).

2⁶⁵⁵²³ is an apocalyptic number.

65523 is a deficient number, since it is larger than the sum of its proper divisors (21845).

65523 is a wasteful number, since it uses less digits than its factorization.

65523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21844.

The product of its digits is 900, while the sum is 21.

The square root of 65523 is about 255.9746081157. The cubic root of 65523 is about 40.3148075718.

It can be divided in two parts, 6552 and 3, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 65523 in words is "sixty-five thousand, five hundred twenty-three".