68719746657109 has 2 divisors, whose sum is σ = 68719746657110. Its totient is φ = 68719746657108.

The previous prime is 68719746657073. The next prime is 68719746657139. The reversal of 68719746657109 is 90175664791786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68506576996900 + 213169660209 = 8276870^2 + 461703^2 .

It is a cyclic number.

It is not a de Polignac number, because 68719746657109 - 2³³ = 68711156722517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68719746657139) 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, 34359873328554 + 34359873328555.

It is an arithmetic number, because the mean of its divisors is an integer number (34359873328555).

Almost surely, 2^{68719746657109} is an apocalyptic number.

It is an amenable number.

68719746657109 is a deficient number, since it is larger than the sum of its proper divisors (1).

68719746657109 is an equidigital number, since it uses as much as digits as its factorization.

68719746657109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960180480, while the sum is 76.

The spelling of 68719746657109 in words is "sixty-eight trillion, seven hundred nineteen billion, seven hundred forty-six million, six hundred fifty-seven thousand, one hundred nine".