6520424004257 has 2 divisors, whose sum is σ = 6520424004258. Its totient is φ = 6520424004256.

The previous prime is 6520424004233. The next prime is 6520424004323. The reversal of 6520424004257 is 7524004240256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4763847525376 + 1756576478881 = 2182624^2 + 1325359^2 .

It is a cyclic number.

It is not a de Polignac number, because 6520424004257 - 2⁸ = 6520424004001 is a prime.

It is not a weakly prime, because it can be changed into another prime (6520424001257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3260212002128 + 3260212002129.

It is an arithmetic number, because the mean of its divisors is an integer number (3260212002129).

Almost surely, 2^{6520424004257} is an apocalyptic number.

It is an amenable number.

6520424004257 is a deficient number, since it is larger than the sum of its proper divisors (1).

6520424004257 is an equidigital number, since it uses as much as digits as its factorization.

6520424004257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 537600, while the sum is 41.

The spelling of 6520424004257 in words is "six trillion, five hundred twenty billion, four hundred twenty-four million, four thousand, two hundred fifty-seven".