665524 has 12 divisors (see below), whose sum is σ = 1170400. Its totient is φ = 331128.

The previous prime is 665507. The next prime is 665527. The reversal of 665524 is 425566.

665524 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 665492 and 665501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665527) 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, 1297 + ... + 1735.

665524 is a Friedman number, since it can be written as (55^(6/2)+6)*4, using all its digits and the basic arithmetic operations.

2⁶⁶⁵⁵²⁴ is an apocalyptic number.

It is an amenable number.

665524 is a deficient number, since it is larger than the sum of its proper divisors (504876).

665524 is a wasteful number, since it uses less digits than its factorization.

665524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822 (or 820 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 665524 is about 815.7965432631. The cubic root of 665524 is about 87.3081073670.

The spelling of 665524 in words is "six hundred sixty-five thousand, five hundred twenty-four".