16723788217 has 2 divisors, whose sum is σ = 16723788218. Its totient is φ = 16723788216.

The previous prime is 16723788181. The next prime is 16723788229. The reversal of 16723788217 is 71288732761.

16723788217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9584214201 + 7139574016 = 97899^2 + 84496^2 .

It is a cyclic number.

It is not a de Polignac number, because 16723788217 - 2¹⁵ = 16723755449 is a prime.

It is not a weakly prime, because it can be changed into another prime (16723788517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8361894108 + 8361894109.

It is an arithmetic number, because the mean of its divisors is an integer number (8361894109).

Almost surely, 2^16723788217 is an apocalyptic number.

It is an amenable number.

16723788217 is a deficient number, since it is larger than the sum of its proper divisors (1).

16723788217 is an equidigital number, since it uses as much as digits as its factorization.

16723788217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1580544, while the sum is 52.

The spelling of 16723788217 in words is "sixteen billion, seven hundred twenty-three million, seven hundred eighty-eight thousand, two hundred seventeen".