129907172052 has 72 divisors (see below), whose sum is σ = 397363127616. Its totient is φ = 34933019904.

The previous prime is 129907172023. The next prime is 129907172141. The reversal of 129907172052 is 250271709921.

It is a junction number, because it is equal to n+sod(n) for n = 129907171989 and 129907172007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15157618 + ... + 15166185.

It is an arithmetic number, because the mean of its divisors is an integer number (5518932328).

Almost surely, 2^129907172052 is an apocalyptic number.

129907172052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129907172052 is an abundant number, since it is smaller than the sum of its proper divisors (267455955564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129907172052 is a wasteful number, since it uses less digits than its factorization.

129907172052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30323837 (or 30323832 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The spelling of 129907172052 in words is "one hundred twenty-nine billion, nine hundred seven million, one hundred seventy-two thousand, fifty-two".