68078161 has 2 divisors, whose sum is σ = 68078162. Its totient is φ = 68078160.

The previous prime is 68078123. The next prime is 68078191. The reversal of 68078161 is 16187086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66732561 + 1345600 = 8169^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 68078161 - 2⁷ = 68078033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68078161.

It is not a weakly prime, because it can be changed into another prime (68078111) 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, 34039080 + 34039081.

It is an arithmetic number, because the mean of its divisors is an integer number (34039081).

Almost surely, 2^68078161 is an apocalyptic number.

It is an amenable number.

68078161 is a deficient number, since it is larger than the sum of its proper divisors (1).

68078161 is an equidigital number, since it uses as much as digits as its factorization.

68078161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 68078161 is about 8250.9490969221. The cubic root of 68078161 is about 408.3218357261.

The spelling of 68078161 in words is "sixty-eight million, seventy-eight thousand, one hundred sixty-one".