665441 has 4 divisors (see below), whose sum is σ = 760512. Its totient is φ = 570372.

The previous prime is 665429. The next prime is 665447. The reversal of 665441 is 144566.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665441 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 665441.

It is not an unprimeable number, because it can be changed into a prime (665447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47525 + ... + 47538.

It is an arithmetic number, because the mean of its divisors is an integer number (190128).

2⁶⁶⁵⁴⁴¹ is an apocalyptic number.

It is an amenable number.

665441 is a deficient number, since it is larger than the sum of its proper divisors (95071).

665441 is an equidigital number, since it uses as much as digits as its factorization.

665441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95070.

The product of its digits is 2880, while the sum is 26.

The square root of 665441 is about 815.7456711500. The cubic root of 665441 is about 87.3044777087.

The spelling of 665441 in words is "six hundred sixty-five thousand, four hundred forty-one".