206665013 has 2 divisors, whose sum is σ = 206665014. Its totient is φ = 206665012.

The previous prime is 206665007. The next prime is 206665087. The reversal of 206665013 is 310566602.

206665013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176172529 + 30492484 = 13273^2 + 5522^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206665013 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206668013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103332506 + 103332507.

It is an arithmetic number, because the mean of its divisors is an integer number (103332507).

Almost surely, 2^206665013 is an apocalyptic number.

It is an amenable number.

206665013 is a deficient number, since it is larger than the sum of its proper divisors (1).

206665013 is an equidigital number, since it uses as much as digits as its factorization.

206665013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 206665013 is about 14375.8482532336. The cubic root of 206665013 is about 591.2288979293.

The spelling of 206665013 in words is "two hundred six million, six hundred sixty-five thousand, thirteen".