678846160049 has 2 divisors, whose sum is σ = 678846160050. Its totient is φ = 678846160048.

The previous prime is 678846160019. The next prime is 678846160063. The reversal of 678846160049 is 940061648876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 604933950625 + 73912209424 = 777775^2 + 271868^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678846160049 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 678846160049.

It is not a weakly prime, because it can be changed into another prime (678846160019) 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, 339423080024 + 339423080025.

It is an arithmetic number, because the mean of its divisors is an integer number (339423080025).

Almost surely, 2^678846160049 is an apocalyptic number.

It is an amenable number.

678846160049 is a deficient number, since it is larger than the sum of its proper divisors (1).

678846160049 is an equidigital number, since it uses as much as digits as its factorization.

678846160049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13934592, while the sum is 59.

The spelling of 678846160049 in words is "six hundred seventy-eight billion, eight hundred forty-six million, one hundred sixty thousand, forty-nine".