129138742657 has 2 divisors, whose sum is σ = 129138742658. Its totient is φ = 129138742656.

The previous prime is 129138742633. The next prime is 129138742673. The reversal of 129138742657 is 756247831921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87796060416 + 41342682241 = 296304^2 + 203329^2 .

It is a cyclic number.

It is not a de Polignac number, because 129138742657 - 2³¹ = 126991259009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129138742598 and 129138742607.

It is not a weakly prime, because it can be changed into another prime (129138742687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64569371328 + 64569371329.

It is an arithmetic number, because the mean of its divisors is an integer number (64569371329).

Almost surely, 2^129138742657 is an apocalyptic number.

It is an amenable number.

129138742657 is a deficient number, since it is larger than the sum of its proper divisors (1).

129138742657 is an equidigital number, since it uses as much as digits as its factorization.

129138742657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 55.

The spelling of 129138742657 in words is "one hundred twenty-nine billion, one hundred thirty-eight million, seven hundred forty-two thousand, six hundred fifty-seven".