16645138327 has 2 divisors, whose sum is σ = 16645138328. Its totient is φ = 16645138326.

The previous prime is 16645138297. The next prime is 16645138331. The reversal of 16645138327 is 72383154661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16645138327 - 2¹⁹ = 16644614039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16645135327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8322569163 + 8322569164.

It is an arithmetic number, because the mean of its divisors is an integer number (8322569164).

Almost surely, 2^16645138327 is an apocalyptic number.

16645138327 is a deficient number, since it is larger than the sum of its proper divisors (1).

16645138327 is an equidigital number, since it uses as much as digits as its factorization.

16645138327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 46.

The spelling of 16645138327 in words is "sixteen billion, six hundred forty-five million, one hundred thirty-eight thousand, three hundred twenty-seven".