128609344787664 has 160 divisors (see below), whose sum is σ = 373440129801984. Its totient is φ = 37878499676160.

The previous prime is 128609344787593. The next prime is 128609344787723. The reversal of 128609344787664 is 466787443906821.

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 31 ways as a sum of consecutive naturals, for example, 46068052 + ... + 48779955.

Almost surely, 2^{128609344787664} is an apocalyptic number.

It is an amenable number.

128609344787664 is an abundant number, since it is smaller than the sum of its proper divisors (244830785014320).

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

128609344787664 is a wasteful number, since it uses less digits than its factorization.

128609344787664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94848125 (or 94848119 counting only the distinct ones).

The product of its (nonzero) digits is 2341011456, while the sum is 75.

The spelling of 128609344787664 in words is "one hundred twenty-eight trillion, six hundred nine billion, three hundred forty-four million, seven hundred eighty-seven thousand, six hundred sixty-four".