206730511217 has 2 divisors, whose sum is σ = 206730511218. Its totient is φ = 206730511216.

The previous prime is 206730511213. The next prime is 206730511243. The reversal of 206730511217 is 712115037602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206689346161 + 41165056 = 454631^2 + 6416^2 .

It is a cyclic number.

It is not a de Polignac number, because 206730511217 - 2² = 206730511213 is a prime.

It is not a weakly prime, because it can be changed into another prime (206730511213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103365255608 + 103365255609.

It is an arithmetic number, because the mean of its divisors is an integer number (103365255609).

Almost surely, 2^206730511217 is an apocalyptic number.

It is an amenable number.

206730511217 is a deficient number, since it is larger than the sum of its proper divisors (1).

206730511217 is an equidigital number, since it uses as much as digits as its factorization.

206730511217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 35.

Adding to 206730511217 its reverse (712115037602), we get a palindrome (918845548819).

The spelling of 206730511217 in words is "two hundred six billion, seven hundred thirty million, five hundred eleven thousand, two hundred seventeen".