261514645353317 has 2 divisors, whose sum is σ = 261514645353318. Its totient is φ = 261514645353316.

The previous prime is 261514645353287. The next prime is 261514645353419. The reversal of 261514645353317 is 713353546415162.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219850189403716 + 41664455949601 = 14827346^2 + 6454801^2 .

It is a cyclic number.

It is not a de Polignac number, because 261514645353317 - 2¹⁰ = 261514645352293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261514665353317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130757322676658 + 130757322676659.

It is an arithmetic number, because the mean of its divisors is an integer number (130757322676659).

Almost surely, 2^{261514645353317} is an apocalyptic number.

It is an amenable number.

261514645353317 is a deficient number, since it is larger than the sum of its proper divisors (1).

261514645353317 is an equidigital number, since it uses as much as digits as its factorization.

261514645353317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216000, while the sum is 56.

The spelling of 261514645353317 in words is "two hundred sixty-one trillion, five hundred fourteen billion, six hundred forty-five million, three hundred fifty-three thousand, three hundred seventeen".