665330 has 8 divisors (see below), whose sum is σ = 1197612. Its totient is φ = 266128.

The previous prime is 665311. The next prime is 665351. The reversal of 665330 is 33566.

Added to its reverse (33566) it gives a square (698896 = 836²).

665330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 628849 + 36481 = 793^2 + 191^2 .

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

It is a plaindrome in base 14.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 665296 and 665305.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33257 + ... + 33276.

2⁶⁶⁵³³⁰ is an apocalyptic number.

665330 is a deficient number, since it is larger than the sum of its proper divisors (532282).

665330 is a wasteful number, since it uses less digits than its factorization.

665330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66540.

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 665330 is about 815.6776324014. The cubic root of 665330 is about 87.2996231155.

Adding to 665330 its reverse (33566), we get a palindrome (698896).

The spelling of 665330 in words is "six hundred sixty-five thousand, three hundred thirty".