678708272609 has 2 divisors, whose sum is σ = 678708272610. Its totient is φ = 678708272608.

The previous prime is 678708272497. The next prime is 678708272651. The reversal of 678708272609 is 906272807876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631751549584 + 46956723025 = 794828^2 + 216695^2 .

It is a cyclic number.

It is not a de Polignac number, because 678708272609 - 2⁸ = 678708272353 is a prime.

It is not a weakly prime, because it can be changed into another prime (678708272699) 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, 339354136304 + 339354136305.

It is an arithmetic number, because the mean of its divisors is an integer number (339354136305).

Almost surely, 2^678708272609 is an apocalyptic number.

It is an amenable number.

678708272609 is a deficient number, since it is larger than the sum of its proper divisors (1).

678708272609 is an equidigital number, since it uses as much as digits as its factorization.

678708272609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28449792, while the sum is 62.

The spelling of 678708272609 in words is "six hundred seventy-eight billion, seven hundred eight million, two hundred seventy-two thousand, six hundred nine".