68697879709 has 2 divisors, whose sum is σ = 68697879710. Its totient is φ = 68697879708.

The previous prime is 68697879671. The next prime is 68697879769. The reversal of 68697879709 is 90797879686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40241563609 + 28456316100 = 200603^2 + 168690^2 .

It is a cyclic number.

It is not a de Polignac number, because 68697879709 - 2⁹ = 68697879197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68697879769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34348939854 + 34348939855.

It is an arithmetic number, because the mean of its divisors is an integer number (34348939855).

Almost surely, 2^68697879709 is an apocalyptic number.

It is an amenable number.

68697879709 is a deficient number, since it is larger than the sum of its proper divisors (1).

68697879709 is an equidigital number, since it uses as much as digits as its factorization.

68697879709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576108288, while the sum is 76.

The spelling of 68697879709 in words is "sixty-eight billion, six hundred ninety-seven million, eight hundred seventy-nine thousand, seven hundred nine".