520522665640421 has 2 divisors, whose sum is σ = 520522665640422. Its totient is φ = 520522665640420.

The previous prime is 520522665640403. The next prime is 520522665640493. The reversal of 520522665640421 is 124046566225025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518154806364196 + 2367859276225 = 22763014^2 + 1538785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520522665640421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 520522665640421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520522665640121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260261332820210 + 260261332820211.

It is an arithmetic number, because the mean of its divisors is an integer number (260261332820211).

Almost surely, 2^{520522665640421} is an apocalyptic number.

It is an amenable number.

520522665640421 is a deficient number, since it is larger than the sum of its proper divisors (1).

520522665640421 is an equidigital number, since it uses as much as digits as its factorization.

520522665640421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912000, while the sum is 50.

The spelling of 520522665640421 in words is "five hundred twenty trillion, five hundred twenty-two billion, six hundred sixty-five million, six hundred forty thousand, four hundred twenty-one".