138865207729 has 2 divisors, whose sum is σ = 138865207730. Its totient is φ = 138865207728.

The previous prime is 138865207711. The next prime is 138865207739. The reversal of 138865207729 is 927702568831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87336207729 + 51529000000 = 295527^2 + 227000^2 .

It is a cyclic number.

It is not a de Polignac number, because 138865207729 - 2⁵ = 138865207697 is a prime.

It is not a weakly prime, because it can be changed into another prime (138865207739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69432603864 + 69432603865.

It is an arithmetic number, because the mean of its divisors is an integer number (69432603865).

Almost surely, 2^138865207729 is an apocalyptic number.

It is an amenable number.

138865207729 is a deficient number, since it is larger than the sum of its proper divisors (1).

138865207729 is an equidigital number, since it uses as much as digits as its factorization.

138865207729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 138865207729 in words is "one hundred thirty-eight billion, eight hundred sixty-five million, two hundred seven thousand, seven hundred twenty-nine".