665013 has 4 divisors (see below), whose sum is σ = 886688. Its totient is φ = 443340.

The previous prime is 665011. The next prime is 665017. The reversal of 665013 is 310566.

665013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 665013 - 2¹ = 665011 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665011) 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, 110833 + ... + 110838.

It is an arithmetic number, because the mean of its divisors is an integer number (221672).

2⁶⁶⁵⁰¹³ is an apocalyptic number.

It is an amenable number.

665013 is a deficient number, since it is larger than the sum of its proper divisors (221675).

665013 is a wasteful number, since it uses less digits than its factorization.

665013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221674.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 665013 is about 815.4832922875. The cubic root of 665013 is about 87.2857561238.

Adding to 665013 its reverse (310566), we get a palindrome (975579).

The spelling of 665013 in words is "six hundred sixty-five thousand, thirteen".