129044320845 has 16 divisors (see below), whose sum is σ = 225240996672. Its totient is φ = 62566943360.

The previous prime is 129044320841. The next prime is 129044320891. The reversal of 129044320845 is 548023440921.

It is a happy number.

It is not a de Polignac number, because 129044320845 - 2² = 129044320841 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 129044320797 and 129044320806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129044320841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391043232 + ... + 391043561.

It is an arithmetic number, because the mean of its divisors is an integer number (14077562292).

Almost surely, 2^129044320845 is an apocalyptic number.

129044320845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129044320845 is a deficient number, since it is larger than the sum of its proper divisors (96196675827).

129044320845 is a wasteful number, since it uses less digits than its factorization.

129044320845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782086812.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 129044320845 in words is "one hundred twenty-nine billion, forty-four million, three hundred twenty thousand, eight hundred forty-five".