520668520685 has 16 divisors (see below), whose sum is σ = 628802596080. Its totient is φ = 413876305920.

The previous prime is 520668520667. The next prime is 520668520693. The reversal of 520668520685 is 586025866025.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 36938533636 + 483729987049 = 192194^2 + 695507^2 .

It is a de Polignac number, because none of the positive numbers 2^k-520668520685 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 28940 + ... + 1020869.

It is an arithmetic number, because the mean of its divisors is an integer number (39300162255).

Almost surely, 2^520668520685 is an apocalyptic number.

It is an amenable number.

520668520685 is a deficient number, since it is larger than the sum of its proper divisors (108134075395).

520668520685 is a wasteful number, since it uses less digits than its factorization.

520668520685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050448.

The product of its (nonzero) digits is 6912000, while the sum is 53.

The spelling of 520668520685 in words is "five hundred twenty billion, six hundred sixty-eight million, five hundred twenty thousand, six hundred eighty-five".