68416709 has 2 divisors, whose sum is σ = 68416710. Its totient is φ = 68416708.

The previous prime is 68416681. The next prime is 68416717. The reversal of 68416709 is 90761486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55920484 + 12496225 = 7478^2 + 3535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68416709 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68416759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34208354 + 34208355.

It is an arithmetic number, because the mean of its divisors is an integer number (34208355).

Almost surely, 2^68416709 is an apocalyptic number.

It is an amenable number.

68416709 is a deficient number, since it is larger than the sum of its proper divisors (1).

68416709 is an equidigital number, since it uses as much as digits as its factorization.

68416709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 68416709 is about 8271.4393547919. The cubic root of 68416709 is about 408.9975689464.

The spelling of 68416709 in words is "sixty-eight million, four hundred sixteen thousand, seven hundred nine".