6567280661 has 2 divisors, whose sum is σ = 6567280662. Its totient is φ = 6567280660.

The previous prime is 6567280639. The next prime is 6567280729. The reversal of 6567280661 is 1660827656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6117586225 + 449694436 = 78215^2 + 21206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6567280661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6567282661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3283640330 + 3283640331.

It is an arithmetic number, because the mean of its divisors is an integer number (3283640331).

Almost surely, 2^6567280661 is an apocalyptic number.

It is an amenable number.

6567280661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6567280661 is an equidigital number, since it uses as much as digits as its factorization.

6567280661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 6567280661 is about 81038.7602385426. The cubic root of 6567280661 is about 1872.6726119796.

The spelling of 6567280661 in words is "six billion, five hundred sixty-seven million, two hundred eighty thousand, six hundred sixty-one".