218537674473857 has 2 divisors, whose sum is σ = 218537674473858. Its totient is φ = 218537674473856.

The previous prime is 218537674473829. The next prime is 218537674473863. The reversal of 218537674473857 is 758374476735812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201597856602256 + 16939817871601 = 14198516^2 + 4115801^2 .

It is a cyclic number.

It is not a de Polignac number, because 218537674473857 - 2⁴⁰ = 217438162846081 is a prime.

It is not a weakly prime, because it can be changed into another prime (218537674473257) 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, 109268837236928 + 109268837236929.

It is an arithmetic number, because the mean of its divisors is an integer number (109268837236929).

Almost surely, 2^{218537674473857} is an apocalyptic number.

It is an amenable number.

218537674473857 is a deficient number, since it is larger than the sum of its proper divisors (1).

218537674473857 is an equidigital number, since it uses as much as digits as its factorization.

218537674473857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6638284800, while the sum is 77.

The spelling of 218537674473857 in words is "two hundred eighteen trillion, five hundred thirty-seven billion, six hundred seventy-four million, four hundred seventy-three thousand, eight hundred fifty-seven".