128866180500 has 288 divisors, whose sum is σ = 422418447360. Its totient is φ = 34296566400.

The previous prime is 128866180483. The next prime is 128866180511. The reversal of 128866180500 is 5081668821.

128866180500 is a `hidden beast` number, since 1 + 2 + 8 + 8 + 6 + 61 + 80 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 104853886 + ... + 104855114.

It is an arithmetic number, because the mean of its divisors is an integer number (1466730720).

Almost surely, 2^128866180500 is an apocalyptic number.

128866180500 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 128866180500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211209223680).

128866180500 is an abundant number, since it is smaller than the sum of its proper divisors (293552266860).

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

128866180500 is a wasteful number, since it uses less digits than its factorization.

128866180500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126 (or 2102 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 128866180500 in words is "one hundred twenty-eight billion, eight hundred sixty-six million, one hundred eighty thousand, five hundred".