1720217130017 has 2 divisors, whose sum is σ = 1720217130018. Its totient is φ = 1720217130016.

The previous prime is 1720217130007. The next prime is 1720217130101. The reversal of 1720217130017 is 7100317120271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1557613825936 + 162603304081 = 1248044^2 + 403241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1720217130017 is a prime.

It is not a weakly prime, because it can be changed into another prime (1720217130007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860108565008 + 860108565009.

It is an arithmetic number, because the mean of its divisors is an integer number (860108565009).

Almost surely, 2^{1720217130017} is an apocalyptic number.

It is an amenable number.

1720217130017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720217130017 is an equidigital number, since it uses as much as digits as its factorization.

1720217130017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4116, while the sum is 32.

The spelling of 1720217130017 in words is "one trillion, seven hundred twenty billion, two hundred seventeen million, one hundred thirty thousand, seventeen".