647830783121 has 2 divisors, whose sum is σ = 647830783122. Its totient is φ = 647830783120.

The previous prime is 647830783111. The next prime is 647830783163. The reversal of 647830783121 is 121387038746.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 572844628225 + 74986154896 = 756865^2 + 273836^2 .

It is a cyclic number.

It is not a de Polignac number, because 647830783121 - 2¹⁰ = 647830782097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647830783121.

It is not a weakly prime, because it can be changed into another prime (647830783111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323915391560 + 323915391561.

It is an arithmetic number, because the mean of its divisors is an integer number (323915391561).

Almost surely, 2^647830783121 is an apocalyptic number.

It is an amenable number.

647830783121 is a deficient number, since it is larger than the sum of its proper divisors (1).

647830783121 is an equidigital number, since it uses as much as digits as its factorization.

647830783121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 647830783121 in words is "six hundred forty-seven billion, eight hundred thirty million, seven hundred eighty-three thousand, one hundred twenty-one".