216546728317 has 2 divisors, whose sum is σ = 216546728318. Its totient is φ = 216546728316.

The previous prime is 216546728311. The next prime is 216546728339. The reversal of 216546728317 is 713827645612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216491061796 + 55666521 = 465286^2 + 7461^2 .

It is a cyclic number.

It is not a de Polignac number, because 216546728317 - 2³ = 216546728309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216546728311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108273364158 + 108273364159.

It is an arithmetic number, because the mean of its divisors is an integer number (108273364159).

Almost surely, 2^216546728317 is an apocalyptic number.

It is an amenable number.

216546728317 is a deficient number, since it is larger than the sum of its proper divisors (1).

216546728317 is an equidigital number, since it uses as much as digits as its factorization.

216546728317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 52.

The spelling of 216546728317 in words is "two hundred sixteen billion, five hundred forty-six million, seven hundred twenty-eight thousand, three hundred seventeen".