128666785632 has 480 divisors, whose sum is σ = 443975261184. Its totient is φ = 32322124800.

The previous prime is 128666785609. The next prime is 128666785651. The reversal of 128666785632 is 236587666821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 78598318 + ... + 78599954.

Almost surely, 2^128666785632 is an apocalyptic number.

128666785632 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 128666785632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221987630592).

128666785632 is an abundant number, since it is smaller than the sum of its proper divisors (315308475552).

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

128666785632 is a wasteful number, since it uses less digits than its factorization.

128666785632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720 (or 1691 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 60.

The spelling of 128666785632 in words is "one hundred twenty-eight billion, six hundred sixty-six million, seven hundred eighty-five thousand, six hundred thirty-two".