678347055667 has 2 divisors, whose sum is σ = 678347055668. Its totient is φ = 678347055666.

The previous prime is 678347055653. The next prime is 678347055671. The reversal of 678347055667 is 766550743876.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678347055667 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678347055599 and 678347055608.

It is not a weakly prime, because it can be changed into another prime (678347055637) 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, 339173527833 + 339173527834.

It is an arithmetic number, because the mean of its divisors is an integer number (339173527834).

Almost surely, 2^678347055667 is an apocalyptic number.

678347055667 is a deficient number, since it is larger than the sum of its proper divisors (1).

678347055667 is an equidigital number, since it uses as much as digits as its factorization.

678347055667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 177811200, while the sum is 64.

The spelling of 678347055667 in words is "six hundred seventy-eight billion, three hundred forty-seven million, fifty-five thousand, six hundred sixty-seven".