647330657 has 2 divisors, whose sum is σ = 647330658. Its totient is φ = 647330656.

The previous prime is 647330647. The next prime is 647330669. The reversal of 647330657 is 756033746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643941376 + 3389281 = 25376^2 + 1841^2 .

It is a cyclic number.

It is not a de Polignac number, because 647330657 - 2¹⁰ = 647329633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647330647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323665328 + 323665329.

It is an arithmetic number, because the mean of its divisors is an integer number (323665329).

Almost surely, 2^647330657 is an apocalyptic number.

It is an amenable number.

647330657 is a deficient number, since it is larger than the sum of its proper divisors (1).

647330657 is an equidigital number, since it uses as much as digits as its factorization.

647330657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 41.

The square root of 647330657 is about 25442.6935877473. The cubic root of 647330657 is about 865.0516890270.

The spelling of 647330657 in words is "six hundred forty-seven million, three hundred thirty thousand, six hundred fifty-seven".