680654459 has 2 divisors, whose sum is σ = 680654460. Its totient is φ = 680654458.

The previous prime is 680654431. The next prime is 680654501. The reversal of 680654459 is 954456086.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 680654459 - 2¹² = 680650363 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (680654419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340327229 + 340327230.

It is an arithmetic number, because the mean of its divisors is an integer number (340327230).

Almost surely, 2^680654459 is an apocalyptic number.

680654459 is a deficient number, since it is larger than the sum of its proper divisors (1).

680654459 is an equidigital number, since it uses as much as digits as its factorization.

680654459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The square root of 680654459 is about 26089.3552814170. The cubic root of 680654459 is about 879.6479562051.

The spelling of 680654459 in words is "six hundred eighty million, six hundred fifty-four thousand, four hundred fifty-nine".