518564221807 has 2 divisors, whose sum is σ = 518564221808. Its totient is φ = 518564221806.

The previous prime is 518564221793. The next prime is 518564221871. The reversal of 518564221807 is 708122465815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 518564221807 - 2²³ = 518555833199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518564221907) 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, 259282110903 + 259282110904.

It is an arithmetic number, because the mean of its divisors is an integer number (259282110904).

Almost surely, 2^518564221807 is an apocalyptic number.

518564221807 is a deficient number, since it is larger than the sum of its proper divisors (1).

518564221807 is an equidigital number, since it uses as much as digits as its factorization.

518564221807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1075200, while the sum is 49.

The spelling of 518564221807 in words is "five hundred eighteen billion, five hundred sixty-four million, two hundred twenty-one thousand, eight hundred seven".