128256111286544 has 80 divisors (see below), whose sum is σ = 257091996688560. Its totient is φ = 61953001144320.

The previous prime is 128256111286543. The next prime is 128256111286549. The reversal of 128256111286544 is 445682111652821.

It can be written as a sum of positive squares in 8 ways, for example, as 2793979110400 + 125462132176144 = 1671520^2 + 11200988^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 128256111286544.

It is not an unprimeable number, because it can be changed into a prime (128256111286543) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 14663054 + ... + 21714450.

It is an arithmetic number, because the mean of its divisors is an integer number (3213649958607).

Almost surely, 2^{128256111286544} is an apocalyptic number.

It is an amenable number.

128256111286544 is an abundant number, since it is smaller than the sum of its proper divisors (128835885402016).

128256111286544 is a wasteful number, since it uses less digits than its factorization.

128256111286544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7051788 (or 7051782 counting only the distinct ones).

The product of its digits is 7372800, while the sum is 56.

The spelling of 128256111286544 in words is "one hundred twenty-eight trillion, two hundred fifty-six billion, one hundred eleven million, two hundred eighty-six thousand, five hundred forty-four".