216718642229 has 2 divisors, whose sum is σ = 216718642230. Its totient is φ = 216718642228.

The previous prime is 216718642201. The next prime is 216718642271. The reversal of 216718642229 is 922246817612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123638734129 + 93079908100 = 351623^2 + 305090^2 .

It is a cyclic number.

It is not a de Polignac number, because 216718642229 - 2²⁸ = 216450206773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216718842229) 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, 108359321114 + 108359321115.

It is an arithmetic number, because the mean of its divisors is an integer number (108359321115).

Almost surely, 2^216718642229 is an apocalyptic number.

It is an amenable number.

216718642229 is a deficient number, since it is larger than the sum of its proper divisors (1).

216718642229 is an equidigital number, since it uses as much as digits as its factorization.

216718642229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 50.

The spelling of 216718642229 in words is "two hundred sixteen billion, seven hundred eighteen million, six hundred forty-two thousand, two hundred twenty-nine".