520551440525 has 6 divisors (see below), whose sum is σ = 645483786282. Its totient is φ = 416441152400.

The previous prime is 520551440491. The next prime is 520551440531. The reversal of 520551440525 is 525044155025.

It can be written as a sum of positive squares in 3 ways, for example, as 12618702889 + 507932737636 = 112333^2 + 712694^2 .

It is a de Polignac number, because none of the positive numbers 2^k-520551440525 is a prime.

It is a super-2 number, since 2×520551440525² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

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 5 ways as a sum of consecutive naturals, for example, 10411028786 + ... + 10411028835.

It is an arithmetic number, because the mean of its divisors is an integer number (107580631047).

Almost surely, 2^520551440525 is an apocalyptic number.

It is an amenable number.

520551440525 is a deficient number, since it is larger than the sum of its proper divisors (124932345757).

520551440525 is a wasteful number, since it uses less digits than its factorization.

520551440525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20822057631 (or 20822057626 counting only the distinct ones).

The product of its (nonzero) digits is 200000, while the sum is 38.

The spelling of 520551440525 in words is "five hundred twenty billion, five hundred fifty-one million, four hundred forty thousand, five hundred twenty-five".