28116716250509 has 2 divisors, whose sum is σ = 28116716250510. Its totient is φ = 28116716250508.

The previous prime is 28116716250503. The next prime is 28116716250533. The reversal of 28116716250509 is 90505261761182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25483788133609 + 2632928116900 = 5048147^2 + 1622630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28116716250509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28116716250503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14058358125254 + 14058358125255.

It is an arithmetic number, because the mean of its divisors is an integer number (14058358125255).

Almost surely, 2^{28116716250509} is an apocalyptic number.

It is an amenable number.

28116716250509 is a deficient number, since it is larger than the sum of its proper divisors (1).

28116716250509 is an equidigital number, since it uses as much as digits as its factorization.

28116716250509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 28116716250509 in words is "twenty-eight trillion, one hundred sixteen billion, seven hundred sixteen million, two hundred fifty thousand, five hundred nine".