665045 has 8 divisors (see below), whose sum is σ = 832896. Its totient is φ = 508816.

The previous prime is 665039. The next prime is 665047. The reversal of 665045 is 540566.

665045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 665045 - 2⁴ = 665029 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665045.

It is not an unprimeable number, because it can be changed into a prime (665047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2777 + ... + 3006.

It is an arithmetic number, because the mean of its divisors is an integer number (104112).

2⁶⁶⁵⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

665045 is a deficient number, since it is larger than the sum of its proper divisors (167851).

665045 is a wasteful number, since it uses less digits than its factorization.

665045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5811.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 665045 is about 815.5029123185. The cubic root of 665045 is about 87.2871561463.

It can be divided in two parts, 66504 and 5, that multiplied together give a triangular number (332520 = T₈₁₅).

The spelling of 665045 in words is "six hundred sixty-five thousand, forty-five".