218787230243297 has 2 divisors, whose sum is σ = 218787230243298. Its totient is φ = 218787230243296.

The previous prime is 218787230243233. The next prime is 218787230243339. The reversal of 218787230243297 is 792342032787812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216395750476816 + 2391479766481 = 14710396^2 + 1546441^2 .

It is a cyclic number.

It is not a de Polignac number, because 218787230243297 - 2⁶ = 218787230243233 is a prime.

It is not a weakly prime, because it can be changed into another prime (218787230243597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109393615121648 + 109393615121649.

It is an arithmetic number, because the mean of its divisors is an integer number (109393615121649).

Almost surely, 2^{218787230243297} is an apocalyptic number.

It is an amenable number.

218787230243297 is a deficient number, since it is larger than the sum of its proper divisors (1).

218787230243297 is an equidigital number, since it uses as much as digits as its factorization.

218787230243297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113799168, while the sum is 65.

The spelling of 218787230243297 in words is "two hundred eighteen trillion, seven hundred eighty-seven billion, two hundred thirty million, two hundred forty-three thousand, two hundred ninety-seven".