128121966000 has 960 divisors, whose sum is σ = 547378715520. Its totient is φ = 28546560000.

The previous prime is 128121965989. The next prime is 128121966001. The reversal of 128121966000 is 669121821.

128121966000 is a `hidden beast` number, since 1 + 28 + 1 + 21 + 9 + 6 + 600 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (128121966001) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 108485410 + ... + 108486590.

It is an arithmetic number, because the mean of its divisors is an integer number (570186162).

Almost surely, 2^128121966000 is an apocalyptic number.

128121966000 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 128121966000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273689357760).

128121966000 is an abundant number, since it is smaller than the sum of its proper divisors (419256749520).

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

128121966000 is a wasteful number, since it uses less digits than its factorization.

128121966000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268 (or 1239 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 128121966000 in words is "one hundred twenty-eight billion, one hundred twenty-one million, nine hundred sixty-six thousand".