128165672885840 has 20 divisors (see below), whose sum is σ = 297985189459764. Its totient is φ = 51266269154304.

The previous prime is 128165672885779. The next prime is 128165672885857. The reversal of 128165672885840 is 48588276561821.

128165672885840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 51695754880576 + 76469918005264 = 7189976^2 + 8744708^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 801035455457 + ... + 801035455616.

Almost surely, 2^{128165672885840} is an apocalyptic number.

128165672885840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128165672885840 is an abundant number, since it is smaller than the sum of its proper divisors (169819516573924).

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

128165672885840 is a wasteful number, since it uses less digits than its factorization.

128165672885840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602070911086 (or 1602070911080 counting only the distinct ones).

The product of its (nonzero) digits is 412876800, while the sum is 71.

The spelling of 128165672885840 in words is "one hundred twenty-eight trillion, one hundred sixty-five billion, six hundred seventy-two million, eight hundred eighty-five thousand, eight hundred forty".