128956859557 has 16 divisors (see below), whose sum is σ = 137463039360. Its totient is φ = 120554518528.

The previous prime is 128956859533. The next prime is 128956859593. The reversal of 128956859557 is 755958659821.

It is a cyclic number.

It is not a de Polignac number, because 128956859557 - 2¹¹ = 128956857509 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 (128956859357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2675253 + ... + 2723029.

It is an arithmetic number, because the mean of its divisors is an integer number (8591439960).

Almost surely, 2^128956859557 is an apocalyptic number.

128956859557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128956859557 is a deficient number, since it is larger than the sum of its proper divisors (8506179803).

128956859557 is a wasteful number, since it uses less digits than its factorization.

128956859557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48860.

The product of its digits is 272160000, while the sum is 70.

The spelling of 128956859557 in words is "one hundred twenty-eight billion, nine hundred fifty-six million, eight hundred fifty-nine thousand, five hundred fifty-seven".