16668316849 has 2 divisors, whose sum is σ = 16668316850. Its totient is φ = 16668316848.

The previous prime is 16668316829. The next prime is 16668316891. The reversal of 16668316849 is 94861386661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16257525025 + 410791824 = 127505^2 + 20268^2 .

It is a cyclic number.

It is not a de Polignac number, because 16668316849 - 2⁵ = 16668316817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16668316793 and 16668316802.

It is not a weakly prime, because it can be changed into another prime (16668316829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334158424 + 8334158425.

It is an arithmetic number, because the mean of its divisors is an integer number (8334158425).

Almost surely, 2^16668316849 is an apocalyptic number.

It is an amenable number.

16668316849 is a deficient number, since it is larger than the sum of its proper divisors (1).

16668316849 is an equidigital number, since it uses as much as digits as its factorization.

16668316849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8957952, while the sum is 58.

The spelling of 16668316849 in words is "sixteen billion, six hundred sixty-eight million, three hundred sixteen thousand, eight hundred forty-nine".