665369 has 2 divisors, whose sum is σ = 665370. Its totient is φ = 665368.

The previous prime is 665359. The next prime is 665381. The reversal of 665369 is 963566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 403225 + 262144 = 635^2 + 512^2 .

It is a cyclic number.

It is not a de Polignac number, because 665369 - 2⁸ = 665113 is a prime.

It is a super-2 number, since 2×665369² = 885431812322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (665359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332684 + 332685.

It is an arithmetic number, because the mean of its divisors is an integer number (332685).

2⁶⁶⁵³⁶⁹ is an apocalyptic number.

It is an amenable number.

665369 is a deficient number, since it is larger than the sum of its proper divisors (1).

665369 is an equidigital number, since it uses as much as digits as its factorization.

665369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 35.

The square root of 665369 is about 815.7015385544. The cubic root of 665369 is about 87.3013288449.

The spelling of 665369 in words is "six hundred sixty-five thousand, three hundred sixty-nine".