128644912957 has 8 divisors (see below), whose sum is σ = 148595193792. Its totient is φ = 110070513600.

The previous prime is 128644912933. The next prime is 128644912961. The reversal of 128644912957 is 759219446821.

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

It is a cyclic number.

It is not a de Polignac number, because 128644912957 - 2⁷ = 128644912829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128644912987) 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, 343970169 + ... + 343970542.

It is an arithmetic number, because the mean of its divisors is an integer number (18574399224).

Almost surely, 2^128644912957 is an apocalyptic number.

128644912957 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128644912957 is a deficient number, since it is larger than the sum of its proper divisors (19950280835).

128644912957 is a wasteful number, since it uses less digits than its factorization.

128644912957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687940739.

The product of its digits is 8709120, while the sum is 58.

The spelling of 128644912957 in words is "one hundred twenty-eight billion, six hundred forty-four million, nine hundred twelve thousand, nine hundred fifty-seven".