666013 has 2 divisors, whose sum is σ = 666014. Its totient is φ = 666012.

The previous prime is 665993. The next prime is 666019. The reversal of 666013 is 310666.

666013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381924 + 284089 = 618^2 + 533^2 .

It is a cyclic number.

It is not a de Polignac number, because 666013 - 2⁵ = 665981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333006 + 333007.

It is an arithmetic number, because the mean of its divisors is an integer number (333007).

2⁶⁶⁶⁰¹³ is an apocalyptic number.

It is an amenable number.

666013 is a deficient number, since it is larger than the sum of its proper divisors (1).

666013 is an equidigital number, since it uses as much as digits as its factorization.

666013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 666013 is about 816.0961953103. The cubic root of 666013 is about 87.3294856154.

Adding to 666013 its reverse (310666), we get a palindrome (976679).

The spelling of 666013 in words is "six hundred sixty-six thousand, thirteen".