520917553543621 has 16 divisors (see below), whose sum is σ = 563339759431680. Its totient is φ = 478831325454720.

The previous prime is 520917553543603. The next prime is 520917553543633. The reversal of 520917553543621 is 126345355719025.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 520917553543621 - 2⁷ = 520917553543493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520917553541621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 447052956 + ... + 448216666.

It is an arithmetic number, because the mean of its divisors is an integer number (35208734964480).

Almost surely, 2^{520917553543621} is an apocalyptic number.

It is an amenable number.

520917553543621 is a deficient number, since it is larger than the sum of its proper divisors (42422205888059).

520917553543621 is a wasteful number, since it uses less digits than its factorization.

520917553543621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308036.

The product of its (nonzero) digits is 34020000, while the sum is 58.

The spelling of 520917553543621 in words is "five hundred twenty trillion, nine hundred seventeen billion, five hundred fifty-three million, five hundred forty-three thousand, six hundred twenty-one".