518366508123 has 4 divisors (see below), whose sum is σ = 691155344168. Its totient is φ = 345577672080.

The previous prime is 518366508119. The next prime is 518366508131. The reversal of 518366508123 is 321805663815.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 518366508123 - 2² = 518366508119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518366508113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86394418018 + ... + 86394418023.

It is an arithmetic number, because the mean of its divisors is an integer number (172788836042).

Almost surely, 2^518366508123 is an apocalyptic number.

518366508123 is a deficient number, since it is larger than the sum of its proper divisors (172788836045).

518366508123 is a wasteful number, since it uses less digits than its factorization.

518366508123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172788836044.

The product of its (nonzero) digits is 1036800, while the sum is 48.

The spelling of 518366508123 in words is "five hundred eighteen billion, three hundred sixty-six million, five hundred eight thousand, one hundred twenty-three".