129855832120 has 256 divisors, whose sum is σ = 379201305600. Its totient is φ = 38947184640.

The previous prime is 129855832061. The next prime is 129855832121. The reversal of 129855832120 is 21238558921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129855832121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4779775 + ... + 4806865.

It is an arithmetic number, because the mean of its divisors is an integer number (1481255100).

Almost surely, 2^129855832120 is an apocalyptic number.

129855832120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129855832120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189600652800).

129855832120 is an abundant number, since it is smaller than the sum of its proper divisors (249345473480).

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

129855832120 is a wasteful number, since it uses less digits than its factorization.

129855832120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27198 (or 27194 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 129855832120 in words is "one hundred twenty-nine billion, eight hundred fifty-five million, eight hundred thirty-two thousand, one hundred twenty".