128968666648 has 32 divisors (see below), whose sum is σ = 248202432000. Its totient is φ = 62795142432.

The previous prime is 128968666609. The next prime is 128968666649. The reversal of 128968666648 is 846666869821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128968666649) 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, 786990 + ... + 936637.

It is an arithmetic number, because the mean of its divisors is an integer number (7756326000).

Almost surely, 2^128968666648 is an apocalyptic number.

It is an amenable number.

128968666648 is a deficient number, since it is larger than the sum of its proper divisors (119233765352).

128968666648 is a wasteful number, since it uses less digits than its factorization.

128968666648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723879 (or 1723875 counting only the distinct ones).

The product of its digits is 286654464, while the sum is 70.

The spelling of 128968666648 in words is "one hundred twenty-eight billion, nine hundred sixty-eight million, six hundred sixty-six thousand, six hundred forty-eight".