129560256000 has 640 divisors, whose sum is σ = 547042129920. Its totient is φ = 29611008000.

The previous prime is 129560255969. The next prime is 129560256011. The reversal of 129560256000 is 652065921.

129560256000 is a `hidden beast` number, since 1 + 2 + 95 + 6 + 0 + 2 + 560 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12090645 + ... + 12101355.

It is an arithmetic number, because the mean of its divisors is an integer number (854753328).

Almost surely, 2^129560256000 is an apocalyptic number.

129560256000 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 129560256000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273521064960).

129560256000 is an abundant number, since it is smaller than the sum of its proper divisors (417481873920).

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

129560256000 is an equidigital number, since it uses as much as digits as its factorization.

129560256000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10760 (or 10728 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 129560256000 in words is "one hundred twenty-nine billion, five hundred sixty million, two hundred fifty-six thousand".