16687197509 has 2 divisors, whose sum is σ = 16687197510. Its totient is φ = 16687197508.

The previous prime is 16687197491. The next prime is 16687197511. The reversal of 16687197509 is 90579178661.

16687197509 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., 16614436609 + 72760900 = 128897^2 + 8530^2 .

It is a cyclic number.

It is not a de Polignac number, because 16687197509 - 2²⁴ = 16670420293 is a prime.

Together with 16687197511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16687197539) 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, 8343598754 + 8343598755.

It is an arithmetic number, because the mean of its divisors is an integer number (8343598755).

Almost surely, 2^16687197509 is an apocalyptic number.

It is an amenable number.

16687197509 is a deficient number, since it is larger than the sum of its proper divisors (1).

16687197509 is an equidigital number, since it uses as much as digits as its factorization.

16687197509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5715360, while the sum is 59.

The spelling of 16687197509 in words is "sixteen billion, six hundred eighty-seven million, one hundred ninety-seven thousand, five hundred nine".