518425936109 has 4 divisors (see below), whose sum is σ = 519017072604. Its totient is φ = 517834799616.

The previous prime is 518425936103. The next prime is 518425936163. The reversal of 518425936109 is 901639524815.

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

It can be written as a sum of positive squares in 2 ways, for example, as 318507853225 + 199918082884 = 564365^2 + 447122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-518425936109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518425936103) 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, 295566932 + ... + 295568685.

It is an arithmetic number, because the mean of its divisors is an integer number (129754268151).

Almost surely, 2^518425936109 is an apocalyptic number.

It is an amenable number.

518425936109 is a deficient number, since it is larger than the sum of its proper divisors (591136495).

518425936109 is an equidigital number, since it uses as much as digits as its factorization.

518425936109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591136494.

The product of its (nonzero) digits is 2332800, while the sum is 53.

The spelling of 518425936109 in words is "five hundred eighteen billion, four hundred twenty-five million, nine hundred thirty-six thousand, one hundred nine".