665465 has 8 divisors (see below), whose sum is σ = 845640. Its totient is φ = 500992.

The previous prime is 665447. The next prime is 665479. The reversal of 665465 is 564566.

It can be written as a sum of positive squares in 4 ways, for example, as 44521 + 620944 = 211^2 + 788^2 .

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 665465 - 2¹⁰ = 664441 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3830 + ... + 3999.

It is an arithmetic number, because the mean of its divisors is an integer number (105705).

2⁶⁶⁵⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

665465 is a deficient number, since it is larger than the sum of its proper divisors (180175).

665465 is a wasteful number, since it uses less digits than its factorization.

665465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7851.

The product of its digits is 21600, while the sum is 32.

The square root of 665465 is about 815.7603814847. The cubic root of 665465 is about 87.3055272794.

The spelling of 665465 in words is "six hundred sixty-five thousand, four hundred sixty-five".