6520425551 has 2 divisors, whose sum is σ = 6520425552. Its totient is φ = 6520425550.

The previous prime is 6520425487. The next prime is 6520425557. The reversal of 6520425551 is 1555240256.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6520425551 - 2⁶ = 6520425487 is a prime.

It is a super-2 number, since 2×6520425551² = 85031898732267307202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6520425557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3260212775 + 3260212776.

It is an arithmetic number, because the mean of its divisors is an integer number (3260212776).

Almost surely, 2^6520425551 is an apocalyptic number.

6520425551 is a deficient number, since it is larger than the sum of its proper divisors (1).

6520425551 is an equidigital number, since it uses as much as digits as its factorization.

6520425551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60000, while the sum is 35.

The square root of 6520425551 is about 80749.1520141233. The cubic root of 6520425551 is about 1868.2083701757.

The spelling of 6520425551 in words is "six billion, five hundred twenty million, four hundred twenty-five thousand, five hundred fifty-one".