520726466621 has 2 divisors, whose sum is σ = 520726466622. Its totient is φ = 520726466620.

The previous prime is 520726466551. The next prime is 520726466627. The reversal of 520726466621 is 126664627025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412363044025 + 108363422596 = 642155^2 + 329186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520726466621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520726466627) 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, 260363233310 + 260363233311.

It is an arithmetic number, because the mean of its divisors is an integer number (260363233311).

Almost surely, 2^520726466621 is an apocalyptic number.

It is an amenable number.

520726466621 is a deficient number, since it is larger than the sum of its proper divisors (1).

520726466621 is an equidigital number, since it uses as much as digits as its factorization.

520726466621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 520726466621 in words is "five hundred twenty billion, seven hundred twenty-six million, four hundred sixty-six thousand, six hundred twenty-one".