680768102221 has 2 divisors, whose sum is σ = 680768102222. Its totient is φ = 680768102220.

The previous prime is 680768102153. The next prime is 680768102227. The reversal of 680768102221 is 122201867086.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638418578121 + 42349524100 = 799011^2 + 205790^2 .

It is a cyclic number.

It is not a de Polignac number, because 680768102221 - 2²¹ = 680766005069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680768102227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340384051110 + 340384051111.

It is an arithmetic number, because the mean of its divisors is an integer number (340384051111).

Almost surely, 2^680768102221 is an apocalyptic number.

It is an amenable number.

680768102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

680768102221 is an equidigital number, since it uses as much as digits as its factorization.

680768102221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 43.

The spelling of 680768102221 in words is "six hundred eighty billion, seven hundred sixty-eight million, one hundred two thousand, two hundred twenty-one".