520521727525 has 6 divisors (see below), whose sum is σ = 645446942162. Its totient is φ = 416417382000.

The previous prime is 520521727501. The next prime is 520521727529. The reversal of 520521727525 is 525727125025.

It can be written as a sum of positive squares in 3 ways, for example, as 2959468801 + 517562258724 = 54401^2 + 719418^2 .

It is not a de Polignac number, because 520521727525 - 2¹⁷ = 520521596453 is a prime.

It is a super-2 number, since 2×520521727525² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520521727529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10410434526 + ... + 10410434575.

Almost surely, 2^520521727525 is an apocalyptic number.

It is an amenable number.

520521727525 is a deficient number, since it is larger than the sum of its proper divisors (124925214637).

520521727525 is a wasteful number, since it uses less digits than its factorization.

520521727525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20820869111 (or 20820869106 counting only the distinct ones).

The product of its (nonzero) digits is 490000, while the sum is 43.

The spelling of 520521727525 in words is "five hundred twenty billion, five hundred twenty-one million, seven hundred twenty-seven thousand, five hundred twenty-five".