68012065409 has 2 divisors, whose sum is σ = 68012065410. Its totient is φ = 68012065408.

The previous prime is 68012065399. The next prime is 68012065423. The reversal of 68012065409 is 90456021086.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41332109809 + 26679955600 = 203303^2 + 163340^2 .

It is a cyclic number.

It is not a de Polignac number, because 68012065409 - 2³² = 63717098113 is a prime.

It is not a weakly prime, because it can be changed into another prime (68012065309) 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, 34006032704 + 34006032705.

It is an arithmetic number, because the mean of its divisors is an integer number (34006032705).

Almost surely, 2^68012065409 is an apocalyptic number.

It is an amenable number.

68012065409 is a deficient number, since it is larger than the sum of its proper divisors (1).

68012065409 is an equidigital number, since it uses as much as digits as its factorization.

68012065409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 68012065409 in words is "sixty-eight billion, twelve million, sixty-five thousand, four hundred nine".