6608668657 has 2 divisors, whose sum is σ = 6608668658. Its totient is φ = 6608668656.

The previous prime is 6608668613. The next prime is 6608668687. The reversal of 6608668657 is 7568668066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5148206001 + 1460462656 = 71751^2 + 38216^2 .

It is a cyclic number.

It is not a de Polignac number, because 6608668657 - 2²⁷ = 6474450929 is a prime.

It is not a weakly prime, because it can be changed into another prime (6608668687) 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, 3304334328 + 3304334329.

It is an arithmetic number, because the mean of its divisors is an integer number (3304334329).

Almost surely, 2^6608668657 is an apocalyptic number.

It is an amenable number.

6608668657 is a deficient number, since it is larger than the sum of its proper divisors (1).

6608668657 is an equidigital number, since it uses as much as digits as its factorization.

6608668657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17418240, while the sum is 58.

The square root of 6608668657 is about 81293.7184350673. The cubic root of 6608668657 is about 1876.5983320107.

The spelling of 6608668657 in words is "six billion, six hundred eight million, six hundred sixty-eight thousand, six hundred fifty-seven".