216556968241129 has 2 divisors, whose sum is σ = 216556968241130. Its totient is φ = 216556968241128.

The previous prime is 216556968241069. The next prime is 216556968241219. The reversal of 216556968241129 is 921142869655612.

Together with next prime (216556968241219) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115499728526400 + 101057239714729 = 10747080^2 + 10052723^2 .

It is a cyclic number.

It is not a de Polignac number, because 216556968241129 - 2²³ = 216556959852521 is a prime.

It is not a weakly prime, because it can be changed into another prime (216556968241829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108278484120564 + 108278484120565.

It is an arithmetic number, because the mean of its divisors is an integer number (108278484120565).

Almost surely, 2^{216556968241129} is an apocalyptic number.

It is an amenable number.

216556968241129 is a deficient number, since it is larger than the sum of its proper divisors (1).

216556968241129 is an equidigital number, since it uses as much as digits as its factorization.

216556968241129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 111974400, while the sum is 67.

The spelling of 216556968241129 in words is "two hundred sixteen trillion, five hundred fifty-six billion, nine hundred sixty-eight million, two hundred forty-one thousand, one hundred twenty-nine".