665329 has 8 divisors (see below), whose sum is σ = 805248. Its totient is φ = 536640.

The previous prime is 665311. The next prime is 665351. The reversal of 665329 is 923566.

665329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665329 - 2⁷ = 665201 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 665329.

It is not an unprimeable number, because it can be changed into a prime (665359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2677 + ... + 2914.

It is an arithmetic number, because the mean of its divisors is an integer number (100656).

2⁶⁶⁵³²⁹ is an apocalyptic number.

It is an amenable number.

665329 is a deficient number, since it is larger than the sum of its proper divisors (139919).

665329 is a wasteful number, since it uses less digits than its factorization.

665329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5615.

The product of its digits is 9720, while the sum is 31.

The square root of 665329 is about 815.6770194139. The cubic root of 665329 is about 87.2995793780.

The spelling of 665329 in words is "six hundred sixty-five thousand, three hundred twenty-nine".