67716307709 has 2 divisors, whose sum is σ = 67716307710. Its totient is φ = 67716307708.

The previous prime is 67716307657. The next prime is 67716307733. The reversal of 67716307709 is 90770361776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62589031684 + 5127276025 = 250178^2 + 71605^2 .

It is a cyclic number.

It is not a de Polignac number, because 67716307709 - 2²⁸ = 67447872253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67716307759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33858153854 + 33858153855.

It is an arithmetic number, because the mean of its divisors is an integer number (33858153855).

Almost surely, 2^67716307709 is an apocalyptic number.

It is an amenable number.

67716307709 is a deficient number, since it is larger than the sum of its proper divisors (1).

67716307709 is an equidigital number, since it uses as much as digits as its factorization.

67716307709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2333772, while the sum is 53.

The spelling of 67716307709 in words is "sixty-seven billion, seven hundred sixteen million, three hundred seven thousand, seven hundred nine".