518001868817 has 2 divisors, whose sum is σ = 518001868818. Its totient is φ = 518001868816.

The previous prime is 518001868781. The next prime is 518001868819. The reversal of 518001868817 is 718868100815.

Together with previous prime (518001868781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 509361980416 + 8639888401 = 713696^2 + 92951^2 .

It is a cyclic number.

It is not a de Polignac number, because 518001868817 - 2²⁰ = 518000820241 is a prime.

Together with 518001868819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (518001868819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259000934408 + 259000934409.

It is an arithmetic number, because the mean of its divisors is an integer number (259000934409).

Almost surely, 2^518001868817 is an apocalyptic number.

It is an amenable number.

518001868817 is a deficient number, since it is larger than the sum of its proper divisors (1).

518001868817 is an equidigital number, since it uses as much as digits as its factorization.

518001868817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 860160, while the sum is 53.

The spelling of 518001868817 in words is "five hundred eighteen billion, one million, eight hundred sixty-eight thousand, eight hundred seventeen".