129115376056 has 8 divisors (see below), whose sum is σ = 242091330120. Its totient is φ = 64557688024.

The previous prime is 129115376029. The next prime is 129115376059. The reversal of 129115376056 is 650673511921.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 129115375997 and 129115376015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129115376059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8069710996 + ... + 8069711011.

It is an arithmetic number, because the mean of its divisors is an integer number (30261416265).

Almost surely, 2^129115376056 is an apocalyptic number.

It is an amenable number.

129115376056 is a deficient number, since it is larger than the sum of its proper divisors (112975954064).

129115376056 is a wasteful number, since it uses less digits than its factorization.

129115376056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16139422013 (or 16139422009 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 46.

Adding to 129115376056 its reverse (650673511921), we get a palindrome (779788887977).

The spelling of 129115376056 in words is "one hundred twenty-nine billion, one hundred fifteen million, three hundred seventy-six thousand, fifty-six".