68738011709 has 2 divisors, whose sum is σ = 68738011710. Its totient is φ = 68738011708.

The previous prime is 68738011687. The next prime is 68738011723. The reversal of 68738011709 is 90711083786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39223802500 + 29514209209 = 198050^2 + 171797^2 .

It is a cyclic number.

It is not a de Polignac number, because 68738011709 - 2²⁰ = 68736963133 is a prime.

It is a super-2 number, since 2×68738011709² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68738011409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34369005854 + 34369005855.

It is an arithmetic number, because the mean of its divisors is an integer number (34369005855).

Almost surely, 2^68738011709 is an apocalyptic number.

It is an amenable number.

68738011709 is a deficient number, since it is larger than the sum of its proper divisors (1).

68738011709 is an equidigital number, since it uses as much as digits as its factorization.

68738011709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 50.

The spelling of 68738011709 in words is "sixty-eight billion, seven hundred thirty-eight million, eleven thousand, seven hundred nine".