216251982497 has 2 divisors, whose sum is σ = 216251982498. Its totient is φ = 216251982496.

The previous prime is 216251982481. The next prime is 216251982581. The reversal of 216251982497 is 794289152612.

216251982497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145221204241 + 71030778256 = 381079^2 + 266516^2 .

It is a cyclic number.

It is not a de Polignac number, because 216251982497 - 2⁴ = 216251982481 is a prime.

It is not a weakly prime, because it can be changed into another prime (216251082497) 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, 108125991248 + 108125991249.

It is an arithmetic number, because the mean of its divisors is an integer number (108125991249).

Almost surely, 2^216251982497 is an apocalyptic number.

It is an amenable number.

216251982497 is a deficient number, since it is larger than the sum of its proper divisors (1).

216251982497 is an equidigital number, since it uses as much as digits as its factorization.

216251982497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 56.

The spelling of 216251982497 in words is "two hundred sixteen billion, two hundred fifty-one million, nine hundred eighty-two thousand, four hundred ninety-seven".