129757623129 has 6 divisors (see below), whose sum is σ = 187427677866. Its totient is φ = 86505082080.

The previous prime is 129757623109. The next prime is 129757623139. The reversal of 129757623129 is 921326757921.

129757623129 is a `hidden beast` number, since 1 + 2 + 9 + 7 + 5 + 7 + 623 + 1 + 2 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 128702997504 + 1054625625 = 358752^2 + 32475^2 .

It is not a de Polignac number, because 129757623129 - 2⁸ = 129757622873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129757623109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7208756832 + ... + 7208756849.

It is an arithmetic number, because the mean of its divisors is an integer number (31237946311).

Almost surely, 2^129757623129 is an apocalyptic number.

It is an amenable number.

129757623129 is a deficient number, since it is larger than the sum of its proper divisors (57670054737).

129757623129 is a wasteful number, since it uses less digits than its factorization.

129757623129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14417513687 (or 14417513684 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The spelling of 129757623129 in words is "one hundred twenty-nine billion, seven hundred fifty-seven million, six hundred twenty-three thousand, one hundred twenty-nine".