665652 has 48 divisors (see below), whose sum is σ = 1778112. Its totient is φ = 192000.

The previous prime is 665633. The next prime is 665659. The reversal of 665652 is 256566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665659) by changing a digit.

665652 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2527 + ... + 2777.

It is an arithmetic number, because the mean of its divisors is an integer number (37044).

2⁶⁶⁵⁶⁵² 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 665652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (889056).

665652 is an abundant number, since it is smaller than the sum of its proper divisors (1112460).

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

665652 is a wasteful number, since it uses less digits than its factorization.

665652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 286 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 665652 is about 815.8749904244. The cubic root of 665652 is about 87.3137043209.

The spelling of 665652 in words is "six hundred sixty-five thousand, six hundred fifty-two".