16668349889 has 2 divisors, whose sum is σ = 16668349890. Its totient is φ = 16668349888.

The previous prime is 16668349883. The next prime is 16668349903. The reversal of 16668349889 is 98894386661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15316537600 + 1351812289 = 123760^2 + 36767^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16668349889 is a prime.

It is not a weakly prime, because it can be changed into another prime (16668349883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334174944 + 8334174945.

It is an arithmetic number, because the mean of its divisors is an integer number (8334174945).

Almost surely, 2^16668349889 is an apocalyptic number.

It is an amenable number.

16668349889 is a deficient number, since it is larger than the sum of its proper divisors (1).

16668349889 is an equidigital number, since it uses as much as digits as its factorization.

16668349889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107495424, while the sum is 68.

The spelling of 16668349889 in words is "sixteen billion, six hundred sixty-eight million, three hundred forty-nine thousand, eight hundred eighty-nine".