128665685403830 has 32 divisors (see below), whose sum is σ = 234204682521600. Its totient is φ = 50887084165632.

The previous prime is 128665685403823. The next prime is 128665685403847. The reversal of 128665685403830 is 38304586566821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49200011 + ... + 51749129.

It is an arithmetic number, because the mean of its divisors is an integer number (7318896328800).

Almost surely, 2^{128665685403830} is an apocalyptic number.

128665685403830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128665685403830 is a deficient number, since it is larger than the sum of its proper divisors (105538997117770).

128665685403830 is a wasteful number, since it uses less digits than its factorization.

128665685403830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2605928.

The product of its (nonzero) digits is 199065600, while the sum is 65.

The spelling of 128665685403830 in words is "one hundred twenty-eight trillion, six hundred sixty-five billion, six hundred eighty-five million, four hundred three thousand, eight hundred thirty".