129744471761 has 2 divisors, whose sum is σ = 129744471762. Its totient is φ = 129744471760.

The previous prime is 129744471721. The next prime is 129744471841. The reversal of 129744471761 is 167174447921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101480473600 + 28263998161 = 318560^2 + 168119^2 .

It is a cyclic number.

It is not a de Polignac number, because 129744471761 - 2⁶ = 129744471697 is a prime.

It is a super-2 number, since 2×129744471761² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129744471721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64872235880 + 64872235881.

It is an arithmetic number, because the mean of its divisors is an integer number (64872235881).

Almost surely, 2^129744471761 is an apocalyptic number.

It is an amenable number.

129744471761 is a deficient number, since it is larger than the sum of its proper divisors (1).

129744471761 is an equidigital number, since it uses as much as digits as its factorization.

129744471761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 53.

The spelling of 129744471761 in words is "one hundred twenty-nine billion, seven hundred forty-four million, four hundred seventy-one thousand, seven hundred sixty-one".