128666105 has 8 divisors (see below), whose sum is σ = 157990272. Its totient is φ = 100538928.

The previous prime is 128666099. The next prime is 128666137. The reversal of 128666105 is 501666821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128666105 - 2¹⁰ = 128665081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299009 + ... + 299438.

It is an arithmetic number, because the mean of its divisors is an integer number (19748784).

Almost surely, 2^128666105 is an apocalyptic number.

It is an amenable number.

128666105 is a deficient number, since it is larger than the sum of its proper divisors (29324167).

128666105 is an equidigital number, since it uses as much as digits as its factorization.

128666105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598495.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 128666105 is about 11343.1082600846. The cubic root of 128666105 is about 504.8411159156.

The spelling of 128666105 in words is "one hundred twenty-eight million, six hundred sixty-six thousand, one hundred five".