16668520207 has 2 divisors, whose sum is σ = 16668520208. Its totient is φ = 16668520206.

The previous prime is 16668520181. The next prime is 16668520223. The reversal of 16668520207 is 70202586661.

It is a strong prime.

It is an emirp because it is prime and its reverse (70202586661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16668520207 - 2⁷ = 16668520079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16668520237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334260103 + 8334260104.

It is an arithmetic number, because the mean of its divisors is an integer number (8334260104).

Almost surely, 2^16668520207 is an apocalyptic number.

16668520207 is a deficient number, since it is larger than the sum of its proper divisors (1).

16668520207 is an equidigital number, since it uses as much as digits as its factorization.

16668520207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 16668520207 in words is "sixteen billion, six hundred sixty-eight million, five hundred twenty thousand, two hundred seven".