1643317489217 has 2 divisors, whose sum is σ = 1643317489218. Its totient is φ = 1643317489216.

The previous prime is 1643317489213. The next prime is 1643317489223. The reversal of 1643317489217 is 7129847133461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 871442787121 + 771874702096 = 933511^2 + 878564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643317489217 - 2² = 1643317489213 is a prime.

It is a super-2 number, since 2×1643317489217² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1643317489213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821658744608 + 821658744609.

It is an arithmetic number, because the mean of its divisors is an integer number (821658744609).

Almost surely, 2^{1643317489217} is an apocalyptic number.

It is an amenable number.

1643317489217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643317489217 is an equidigital number, since it uses as much as digits as its factorization.

1643317489217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 56.

The spelling of 1643317489217 in words is "one trillion, six hundred forty-three billion, three hundred seventeen million, four hundred eighty-nine thousand, two hundred seventeen".