680548643 has 2 divisors, whose sum is σ = 680548644. Its totient is φ = 680548642.

The previous prime is 680548637. The next prime is 680548651. The reversal of 680548643 is 346845086.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 680548643 - 2¹⁸ = 680286499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 680548594 and 680548603.

It is not a weakly prime, because it can be changed into another prime (680548613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340274321 + 340274322.

It is an arithmetic number, because the mean of its divisors is an integer number (340274322).

Almost surely, 2^680548643 is an apocalyptic number.

680548643 is a deficient number, since it is larger than the sum of its proper divisors (1).

680548643 is an equidigital number, since it uses as much as digits as its factorization.

680548643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 44.

The square root of 680548643 is about 26087.3272490687. The cubic root of 680548643 is about 879.6023698576.

The spelling of 680548643 in words is "six hundred eighty million, five hundred forty-eight thousand, six hundred forty-three".