678415697 has 2 divisors, whose sum is σ = 678415698. Its totient is φ = 678415696.

The previous prime is 678415657. The next prime is 678415733. The reversal of 678415697 is 796514876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 614990401 + 63425296 = 24799^2 + 7964^2 .

It is a cyclic number.

It is not a de Polignac number, because 678415697 - 2¹⁰ = 678414673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (678415627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339207848 + 339207849.

It is an arithmetic number, because the mean of its divisors is an integer number (339207849).

Almost surely, 2^678415697 is an apocalyptic number.

It is an amenable number.

678415697 is a deficient number, since it is larger than the sum of its proper divisors (1).

678415697 is an equidigital number, since it uses as much as digits as its factorization.

678415697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 53.

The square root of 678415697 is about 26046.4142829680. The cubic root of 678415697 is about 878.6824709696.

The spelling of 678415697 in words is "six hundred seventy-eight million, four hundred fifteen thousand, six hundred ninety-seven".