128665685403831 has 8 divisors (see below), whose sum is σ = 180583418110720. Its totient is φ = 81262538149752.

The previous prime is 128665685403823. The next prime is 128665685403847. The reversal of 128665685403831 is 138304586566821.

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

It is not a de Polignac number, because 128665685403831 - 2³ = 128665685403823 is a prime.

It is a super-2 number, since 2×128665685403831² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128665685413831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1128646363135 + ... + 1128646363248.

It is an arithmetic number, because the mean of its divisors is an integer number (22572927263840).

Almost surely, 2^{128665685403831} is an apocalyptic number.

128665685403831 is a deficient number, since it is larger than the sum of its proper divisors (51917732706889).

128665685403831 is a wasteful number, since it uses less digits than its factorization.

128665685403831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2257292726405.

The product of its (nonzero) digits is 199065600, while the sum is 66.

The spelling of 128665685403831 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-one".