6528681641 has 2 divisors, whose sum is σ = 6528681642. Its totient is φ = 6528681640.

The previous prime is 6528681613. The next prime is 6528681647. The reversal of 6528681641 is 1461868256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6521370025 + 7311616 = 80755^2 + 2704^2 .

It is a cyclic number.

It is not a de Polignac number, because 6528681641 - 2¹⁸ = 6528419497 is a prime.

It is not a weakly prime, because it can be changed into another prime (6528681647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3264340820 + 3264340821.

It is an arithmetic number, because the mean of its divisors is an integer number (3264340821).

Almost surely, 2^6528681641 is an apocalyptic number.

It is an amenable number.

6528681641 is a deficient number, since it is larger than the sum of its proper divisors (1).

6528681641 is an equidigital number, since it uses as much as digits as its factorization.

6528681641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 47.

The square root of 6528681641 is about 80800.2576790446. The cubic root of 6528681641 is about 1868.9965391358.

The spelling of 6528681641 in words is "six billion, five hundred twenty-eight million, six hundred eighty-one thousand, six hundred forty-one".