67678188449 has 2 divisors, whose sum is σ = 67678188450. Its totient is φ = 67678188448.

The previous prime is 67678188343. The next prime is 67678188497. The reversal of 67678188449 is 94488187676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66973816849 + 704371600 = 258793^2 + 26540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67678188449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (67678188049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33839094224 + 33839094225.

It is an arithmetic number, because the mean of its divisors is an integer number (33839094225).

Almost surely, 2^67678188449 is an apocalyptic number.

It is an amenable number.

67678188449 is a deficient number, since it is larger than the sum of its proper divisors (1).

67678188449 is an equidigital number, since it uses as much as digits as its factorization.

67678188449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 130056192, while the sum is 68.

The spelling of 67678188449 in words is "sixty-seven billion, six hundred seventy-eight million, one hundred eighty-eight thousand, four hundred forty-nine".