665532 has 72 divisors (see below), whose sum is σ = 2038400. Its totient is φ = 178848.

The previous prime is 665527. The next prime is 665549. The reversal of 665532 is 235566.

665532 is a `hidden beast` number, since 6 + 655 + 3 + 2 = 666.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 665496 and 665505.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 4719 + ... + 4857.

2⁶⁶⁵⁵³² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019200).

665532 is an abundant number, since it is smaller than the sum of its proper divisors (1372868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665532 is a wasteful number, since it uses less digits than its factorization.

665532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 170 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 665532 is about 815.8014464317. The cubic root of 665532 is about 87.3084571976.

The spelling of 665532 in words is "six hundred sixty-five thousand, five hundred thirty-two".