6751688521 has 2 divisors, whose sum is σ = 6751688522. Its totient is φ = 6751688520.

The previous prime is 6751688507. The next prime is 6751688543. The reversal of 6751688521 is 1258861576.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6750922896 + 765625 = 82164^2 + 875^2 .

It is a cyclic number.

It is not a de Polignac number, because 6751688521 - 2⁷ = 6751688393 is a prime.

It is a super-3 number, since 3×6751688521³ (a number of 30 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (6751688221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3375844260 + 3375844261.

It is an arithmetic number, because the mean of its divisors is an integer number (3375844261).

Almost surely, 2^6751688521 is an apocalyptic number.

It is an amenable number.

6751688521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6751688521 is an equidigital number, since it uses as much as digits as its factorization.

6751688521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806400, while the sum is 49.

The square root of 6751688521 is about 82168.6589947773. The cubic root of 6751688521 is about 1890.0391471227.

The spelling of 6751688521 in words is "six billion, seven hundred fifty-one million, six hundred eighty-eight thousand, five hundred twenty-one".