520808128805 has 4 divisors (see below), whose sum is σ = 624969754572. Its totient is φ = 416646503040.

The previous prime is 520808128787. The next prime is 520808128829. The reversal of 520808128805 is 508821808025.

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 78096214849 + 442711913956 = 279457^2 + 665366^2 .

It is not a de Polignac number, because 520808128805 - 2⁶ = 520808128741 is a prime.

It is a super-2 number, since 2×520808128805² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520808128805.

It is a congruent number.

It is an unprimeable number.

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, 52080812876 + ... + 52080812885.

It is an arithmetic number, because the mean of its divisors is an integer number (156242438643).

Almost surely, 2^520808128805 is an apocalyptic number.

It is an amenable number.

520808128805 is a deficient number, since it is larger than the sum of its proper divisors (104161625767).

520808128805 is a wasteful number, since it uses less digits than its factorization.

520808128805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104161625766.

The product of its (nonzero) digits is 409600, while the sum is 47.

The spelling of 520808128805 in words is "five hundred twenty billion, eight hundred eight million, one hundred twenty-eight thousand, eight hundred five".