129561841332 has 576 divisors, whose sum is σ = 439288012800. Its totient is φ = 32065113600.

The previous prime is 129561841273. The next prime is 129561841373. The reversal of 129561841332 is 233148165921.

129561841332 is a `hidden beast` number, since 1 + 2 + 9 + 561 + 84 + 1 + 3 + 3 + 2 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

Its product of digits (311040) is a multiple of the sum of its prime divisors (216).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1640023269 + ... + 1640023347.

It is an arithmetic number, because the mean of its divisors is an integer number (762652800).

Almost surely, 2^129561841332 is an apocalyptic number.

129561841332 is a gapful number since it is divisible by the number (12) 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 129561841332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219644006400).

129561841332 is an abundant number, since it is smaller than the sum of its proper divisors (309726171468).

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

129561841332 is a wasteful number, since it uses less digits than its factorization.

129561841332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285 (or 216 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The spelling of 129561841332 in words is "one hundred twenty-nine billion, five hundred sixty-one million, eight hundred forty-one thousand, three hundred thirty-two".