218266344281 has 2 divisors, whose sum is σ = 218266344282. Its totient is φ = 218266344280.

The previous prime is 218266344259. The next prime is 218266344299. The reversal of 218266344281 is 182443662812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216815953225 + 1450391056 = 465635^2 + 38084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218266344281 is a prime.

It is a super-2 number, since 2×218266344281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (218266344481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109133172140 + 109133172141.

It is an arithmetic number, because the mean of its divisors is an integer number (109133172141).

Almost surely, 2^218266344281 is an apocalyptic number.

It is an amenable number.

218266344281 is a deficient number, since it is larger than the sum of its proper divisors (1).

218266344281 is an equidigital number, since it uses as much as digits as its factorization.

218266344281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 884736, while the sum is 47.

The spelling of 218266344281 in words is "two hundred eighteen billion, two hundred sixty-six million, three hundred forty-four thousand, two hundred eighty-one".