1643317489049 has 2 divisors, whose sum is σ = 1643317489050. Its totient is φ = 1643317489048.

The previous prime is 1643317489043. The next prime is 1643317489069. The reversal of 1643317489049 is 9409847133461.

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., 1032981551449 + 610335937600 = 1016357^2 + 781240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1643317489049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1643317489043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821658744524 + 821658744525.

It is an arithmetic number, because the mean of its divisors is an integer number (821658744525).

Almost surely, 2^{1643317489049} is an apocalyptic number.

It is an amenable number.

1643317489049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643317489049 is an equidigital number, since it uses as much as digits as its factorization.

1643317489049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15676416, while the sum is 59.

The spelling of 1643317489049 in words is "one trillion, six hundred forty-three billion, three hundred seventeen million, four hundred eighty-nine thousand, forty-nine".