129568704123 has 6 divisors (see below), whose sum is σ = 172759103452. Its totient is φ = 86378720440.

The previous prime is 129568704119. The next prime is 129568704149. The reversal of 129568704123 is 321407865921.

It is not a de Polignac number, because 129568704123 - 2² = 129568704119 is a prime.

It is a super-2 number, since 2×129568704123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129568704113) 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, 519553 + ... + 727373.

It is a 2-persistent number, because it is pandigital, and so is 2⋅129568704123 = 259137408246, but 3⋅129568704123 = 388706112369 is not.

Almost surely, 2^129568704123 is an apocalyptic number.

129568704123 is a deficient number, since it is larger than the sum of its proper divisors (43190399329).

129568704123 is an frugal number, since it uses more digits than its factorization.

129568704123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415645 (or 207824 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

Multiplying 129568704123 by its sum of digits (48), we get a square (6219297797904 = 2493852²).

The spelling of 129568704123 in words is "one hundred twenty-nine billion, five hundred sixty-eight million, seven hundred four thousand, one hundred twenty-three".