261230852017 has 2 divisors, whose sum is σ = 261230852018. Its totient is φ = 261230852016.

The previous prime is 261230851969. The next prime is 261230852039. The reversal of 261230852017 is 710258032162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244469924721 + 16760927296 = 494439^2 + 129464^2 .

It is a cyclic number.

It is not a de Polignac number, because 261230852017 - 2²⁷ = 261096634289 is a prime.

It is not a weakly prime, because it can be changed into another prime (261230850017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130615426008 + 130615426009.

It is an arithmetic number, because the mean of its divisors is an integer number (130615426009).

Almost surely, 2^261230852017 is an apocalyptic number.

It is an amenable number.

261230852017 is a deficient number, since it is larger than the sum of its proper divisors (1).

261230852017 is an equidigital number, since it uses as much as digits as its factorization.

261230852017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

Adding to 261230852017 its reverse (710258032162), we get a palindrome (971488884179).

The spelling of 261230852017 in words is "two hundred sixty-one billion, two hundred thirty million, eight hundred fifty-two thousand, seventeen".