518209780073 has 2 divisors, whose sum is σ = 518209780074. Its totient is φ = 518209780072.

The previous prime is 518209780003. The next prime is 518209780093. The reversal of 518209780073 is 370087902815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514509247849 + 3700532224 = 717293^2 + 60832^2 .

It is a cyclic number.

It is not a de Polignac number, because 518209780073 - 2¹⁰ = 518209779049 is a prime.

It is not a weakly prime, because it can be changed into another prime (518209780003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259104890036 + 259104890037.

It is an arithmetic number, because the mean of its divisors is an integer number (259104890037).

Almost surely, 2^518209780073 is an apocalyptic number.

It is an amenable number.

518209780073 is a deficient number, since it is larger than the sum of its proper divisors (1).

518209780073 is an equidigital number, since it uses as much as digits as its factorization.

518209780073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 518209780073 in words is "five hundred eighteen billion, two hundred nine million, seven hundred eighty thousand, seventy-three".