16668254893 has 2 divisors, whose sum is σ = 16668254894. Its totient is φ = 16668254892.

The previous prime is 16668254839. The next prime is 16668254909. The reversal of 16668254893 is 39845286661.

Together with previous prime (16668254839) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16510451049 + 157803844 = 128493^2 + 12562^2 .

It is an emirp because it is prime and its reverse (39845286661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16668254893 - 2⁹ = 16668254381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16668254833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334127446 + 8334127447.

It is an arithmetic number, because the mean of its divisors is an integer number (8334127447).

Almost surely, 2^16668254893 is an apocalyptic number.

It is an amenable number.

16668254893 is a deficient number, since it is larger than the sum of its proper divisors (1).

16668254893 is an equidigital number, since it uses as much as digits as its factorization.

16668254893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14929920, while the sum is 58.

The spelling of 16668254893 in words is "sixteen billion, six hundred sixty-eight million, two hundred fifty-four thousand, eight hundred ninety-three".