128256155644 has 24 divisors (see below), whose sum is σ = 227053895040. Its totient is φ = 63387906096.

The previous prime is 128256155623. The next prime is 128256155701. The reversal of 128256155644 is 446551652821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416742 + ... + 655885.

It is an arithmetic number, because the mean of its divisors is an integer number (9460578960).

Almost surely, 2^128256155644 is an apocalyptic number.

It is an amenable number.

128256155644 is a deficient number, since it is larger than the sum of its proper divisors (98797739396).

128256155644 is a wasteful number, since it uses less digits than its factorization.

128256155644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072977 (or 1072975 counting only the distinct ones).

The product of its digits is 2304000, while the sum is 49.

The spelling of 128256155644 in words is "one hundred twenty-eight billion, two hundred fifty-six million, one hundred fifty-five thousand, six hundred forty-four".