665258 has 12 divisors (see below), whose sum is σ = 1097250. Its totient is φ = 302280.

The previous prime is 665251. The next prime is 665267. The reversal of 665258 is 852566.

Added to its reverse (852566) it gives a square (1517824 = 1232²).

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 644809 + 20449 = 803^2 + 143^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665258.

It is not an unprimeable number, because it can be changed into a prime (665251) by changing a digit.

665258 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1133 + ... + 1616.

2⁶⁶⁵²⁵⁸ is an apocalyptic number.

665258 is a deficient number, since it is larger than the sum of its proper divisors (431992).

665258 is a wasteful number, since it uses less digits than its factorization.

665258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2773 (or 2762 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 665258 is about 815.6334961243. The cubic root of 665258 is about 87.2964739016.

Adding to 665258 its reverse (852566), we get a square (1517824 = 1232²).

The spelling of 665258 in words is "six hundred sixty-five thousand, two hundred fifty-eight".