660013 has 2 divisors, whose sum is σ = 660014. Its totient is φ = 660012.

The previous prime is 660001. The next prime is 660029. The reversal of 660013 is 310066.

It is a happy number.

It is an a-pointer prime, because the next prime (660029) can be obtained adding 660013 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514089 + 145924 = 717^2 + 382^2 .

It is a cyclic number.

It is not a de Polignac number, because 660013 - 2⁹ = 659501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330006 + 330007.

It is an arithmetic number, because the mean of its divisors is an integer number (330007).

2⁶⁶⁰⁰¹³ is an apocalyptic number.

It is an amenable number.

660013 is a deficient number, since it is larger than the sum of its proper divisors (1).

660013 is an equidigital number, since it uses as much as digits as its factorization.

660013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 660013 is about 812.4118413711. The cubic root of 660013 is about 87.0664485526.

Adding to 660013 its reverse (310066), we get a palindrome (970079).

The spelling of 660013 in words is "six hundred sixty thousand, thirteen".