16301720509 has 2 divisors, whose sum is σ = 16301720510. Its totient is φ = 16301720508.

The previous prime is 16301720507. The next prime is 16301720573. The reversal of 16301720509 is 90502710361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13053062500 + 3248658009 = 114250^2 + 56997^2 .

It is a cyclic number.

It is not a de Polignac number, because 16301720509 - 2¹ = 16301720507 is a prime.

Together with 16301720507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16301720503) 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, 8150860254 + 8150860255.

It is an arithmetic number, because the mean of its divisors is an integer number (8150860255).

Almost surely, 2^16301720509 is an apocalyptic number.

It is an amenable number.

16301720509 is a deficient number, since it is larger than the sum of its proper divisors (1).

16301720509 is an equidigital number, since it uses as much as digits as its factorization.

16301720509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 34.

The spelling of 16301720509 in words is "sixteen billion, three hundred one million, seven hundred twenty thousand, five hundred nine".