218639075899369 has 2 divisors, whose sum is σ = 218639075899370. Its totient is φ = 218639075899368.

The previous prime is 218639075899339. The next prime is 218639075899421. The reversal of 218639075899369 is 963998570936812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116325608139225 + 102313467760144 = 10785435^2 + 10115012^2 .

It is a cyclic number.

It is not a de Polignac number, because 218639075899369 - 2¹¹ = 218639075897321 is a prime.

It is a super-2 number, since 2×218639075899369² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (218639075899339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109319537949684 + 109319537949685.

It is an arithmetic number, because the mean of its divisors is an integer number (109319537949685).

Almost surely, 2^{218639075899369} is an apocalyptic number.

It is an amenable number.

218639075899369 is a deficient number, since it is larger than the sum of its proper divisors (1).

218639075899369 is an equidigital number, since it uses as much as digits as its factorization.

218639075899369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9523422720, while the sum is 85.

The spelling of 218639075899369 in words is "two hundred eighteen trillion, six hundred thirty-nine billion, seventy-five million, eight hundred ninety-nine thousand, three hundred sixty-nine".