16645678313207 has 2 divisors, whose sum is σ = 16645678313208. Its totient is φ = 16645678313206.

The previous prime is 16645678313191. The next prime is 16645678313227. The reversal of 16645678313207 is 70231387654661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16645678313207 - 2⁴ = 16645678313191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16645678313227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8322839156603 + 8322839156604.

It is an arithmetic number, because the mean of its divisors is an integer number (8322839156604).

Almost surely, 2^{16645678313207} is an apocalyptic number.

16645678313207 is a deficient number, since it is larger than the sum of its proper divisors (1).

16645678313207 is an equidigital number, since it uses as much as digits as its factorization.

16645678313207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30481920, while the sum is 59.

The spelling of 16645678313207 in words is "sixteen trillion, six hundred forty-five billion, six hundred seventy-eight million, three hundred thirteen thousand, two hundred seven".