129236165908 has 6 divisors (see below), whose sum is σ = 226163290346. Its totient is φ = 64618082952.

The previous prime is 129236165897. The next prime is 129236165909. The reversal of 129236165908 is 809561632921.

It can be written as a sum of positive squares in only one way, i.e., 74740998544 + 54495167364 = 273388^2 + 233442^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129236165909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16154520735 + ... + 16154520742.

Almost surely, 2^129236165908 is an apocalyptic number.

It is an amenable number.

129236165908 is a deficient number, since it is larger than the sum of its proper divisors (96927124438).

129236165908 is a wasteful number, since it uses less digits than its factorization.

129236165908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32309041481 (or 32309041479 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 129236165908 in words is "one hundred twenty-nine billion, two hundred thirty-six million, one hundred sixty-five thousand, nine hundred eight".