218868688667 has 2 divisors, whose sum is σ = 218868688668. Its totient is φ = 218868688666.

The previous prime is 218868688651. The next prime is 218868688693. The reversal of 218868688667 is 766886868812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218868688667 - 2⁴ = 218868688651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218868688594 and 218868688603.

It is not a weakly prime, because it can be changed into another prime (218868688607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109434344333 + 109434344334.

It is an arithmetic number, because the mean of its divisors is an integer number (109434344334).

Almost surely, 2^218868688667 is an apocalyptic number.

218868688667 is a deficient number, since it is larger than the sum of its proper divisors (1).

218868688667 is an equidigital number, since it uses as much as digits as its factorization.

218868688667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 594542592, while the sum is 74.

The spelling of 218868688667 in words is "two hundred eighteen billion, eight hundred sixty-eight million, six hundred eighty-eight thousand, six hundred sixty-seven".