680168653 has 2 divisors, whose sum is σ = 680168654. Its totient is φ = 680168652.

The previous prime is 680168651. The next prime is 680168689. The reversal of 680168653 is 356861086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 501625609 + 178543044 = 22397^2 + 13362^2 .

It is a cyclic number.

It is not a de Polignac number, because 680168653 - 2¹ = 680168651 is a prime.

Together with 680168651, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680168651) 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, 340084326 + 340084327.

It is an arithmetic number, because the mean of its divisors is an integer number (340084327).

Almost surely, 2^680168653 is an apocalyptic number.

It is an amenable number.

680168653 is a deficient number, since it is larger than the sum of its proper divisors (1).

680168653 is an equidigital number, since it uses as much as digits as its factorization.

680168653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 680168653 is about 26080.0431939826. The cubic root of 680168653 is about 879.4386282765.

The spelling of 680168653 in words is "six hundred eighty million, one hundred sixty-eight thousand, six hundred fifty-three".