678717953 has 2 divisors, whose sum is σ = 678717954. Its totient is φ = 678717952.

The previous prime is 678717859. The next prime is 678717959. The reversal of 678717953 is 359717876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 676624144 + 2093809 = 26012^2 + 1447^2 .

It is a cyclic number.

It is not a de Polignac number, because 678717953 - 2¹² = 678713857 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 678717895 and 678717904.

It is not a weakly prime, because it can be changed into another prime (678717959) 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, 339358976 + 339358977.

It is an arithmetic number, because the mean of its divisors is an integer number (339358977).

Almost surely, 2^678717953 is an apocalyptic number.

It is an amenable number.

678717953 is a deficient number, since it is larger than the sum of its proper divisors (1).

678717953 is an equidigital number, since it uses as much as digits as its factorization.

678717953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2222640, while the sum is 53.

The square root of 678717953 is about 26052.2158942382. The cubic root of 678717953 is about 878.8129453564.

The spelling of 678717953 in words is "six hundred seventy-eight million, seven hundred seventeen thousand, nine hundred fifty-three".