518056818457 has 4 divisors (see below), whose sum is σ = 519549777936. Its totient is φ = 516563858980.

The previous prime is 518056818443. The next prime is 518056818473. The reversal of 518056818457 is 754818650815.

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: 754818650815 = 5 ⋅150963730163.

It is a cyclic number.

It is not a de Polignac number, because 518056818457 - 2¹⁵ = 518056785689 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518056818157) 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 in 3 ways as a sum of consecutive naturals, for example, 746479219 + ... + 746479912.

It is an arithmetic number, because the mean of its divisors is an integer number (129887444484).

Almost surely, 2^518056818457 is an apocalyptic number.

It is an amenable number.

518056818457 is a deficient number, since it is larger than the sum of its proper divisors (1492959479).

518056818457 is a wasteful number, since it uses less digits than its factorization.

518056818457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492959478.

The product of its (nonzero) digits is 10752000, while the sum is 58.

The spelling of 518056818457 in words is "five hundred eighteen billion, fifty-six million, eight hundred eighteen thousand, four hundred fifty-seven".