717220561361 has 2 divisors, whose sum is σ = 717220561362. Its totient is φ = 717220561360.

The previous prime is 717220561339. The next prime is 717220561397. The reversal of 717220561361 is 163165022717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 713274837136 + 3945724225 = 844556^2 + 62815^2 .

It is an emirp because it is prime and its reverse (163165022717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 717220561361 - 2¹⁴ = 717220544977 is a prime.

It is not a weakly prime, because it can be changed into another prime (717220561301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358610280680 + 358610280681.

It is an arithmetic number, because the mean of its divisors is an integer number (358610280681).

Almost surely, 2^717220561361 is an apocalyptic number.

It is an amenable number.

717220561361 is a deficient number, since it is larger than the sum of its proper divisors (1).

717220561361 is an equidigital number, since it uses as much as digits as its factorization.

717220561361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 717220561361 in words is "seven hundred seventeen billion, two hundred twenty million, five hundred sixty-one thousand, three hundred sixty-one".