518550385217 has 4 divisors (see below), whose sum is σ = 518553240576. Its totient is φ = 518547529860.

The previous prime is 518550385201. The next prime is 518550385231. The reversal of 518550385217 is 712583055815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 712583055815 = 5 ⋅142516611163.

It is a cyclic number.

It is not a de Polignac number, because 518550385217 - 2⁴ = 518550385201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518550385237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1135313 + ... + 1525134.

It is an arithmetic number, because the mean of its divisors is an integer number (129638310144).

Almost surely, 2^518550385217 is an apocalyptic number.

It is an amenable number.

518550385217 is a deficient number, since it is larger than the sum of its proper divisors (2855359).

518550385217 is a wasteful number, since it uses less digits than its factorization.

518550385217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2855358.

The product of its (nonzero) digits is 1680000, while the sum is 50.

The spelling of 518550385217 in words is "five hundred eighteen billion, five hundred fifty million, three hundred eighty-five thousand, two hundred seventeen".