218939378233 has 2 divisors, whose sum is σ = 218939378234. Its totient is φ = 218939378232.

The previous prime is 218939378117. The next prime is 218939378239. The reversal of 218939378233 is 332873939812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185344887289 + 33594490944 = 430517^2 + 183288^2 .

It is a cyclic number.

It is not a de Polignac number, because 218939378233 - 2¹⁷ = 218939247161 is a prime.

It is not a weakly prime, because it can be changed into another prime (218939378239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109469689116 + 109469689117.

It is an arithmetic number, because the mean of its divisors is an integer number (109469689117).

Almost surely, 2^218939378233 is an apocalyptic number.

It is an amenable number.

218939378233 is a deficient number, since it is larger than the sum of its proper divisors (1).

218939378233 is an equidigital number, since it uses as much as digits as its factorization.

218939378233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11757312, while the sum is 58.

The spelling of 218939378233 in words is "two hundred eighteen billion, nine hundred thirty-nine million, three hundred seventy-eight thousand, two hundred thirty-three".