260644130209 has 2 divisors, whose sum is σ = 260644130210. Its totient is φ = 260644130208.

The previous prime is 260644130189. The next prime is 260644130213. The reversal of 260644130209 is 902031446062.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235962777600 + 24681352609 = 485760^2 + 157103^2 .

It is a cyclic number.

It is not a de Polignac number, because 260644130209 - 2¹³ = 260644122017 is a prime.

It is a super-2 number, since 2×260644130209² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (260644130609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130322065104 + 130322065105.

It is an arithmetic number, because the mean of its divisors is an integer number (130322065105).

Almost surely, 2^260644130209 is an apocalyptic number.

It is an amenable number.

260644130209 is a deficient number, since it is larger than the sum of its proper divisors (1).

260644130209 is an equidigital number, since it uses as much as digits as its factorization.

260644130209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 260644130209 in words is "two hundred sixty billion, six hundred forty-four million, one hundred thirty thousand, two hundred nine".