128281012447557 has 4 divisors (see below), whose sum is σ = 171041349930080. Its totient is φ = 85520674965036.

The previous prime is 128281012447529. The next prime is 128281012447571. The reversal of 128281012447557 is 755744210182821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 128281012447557 - 2⁷ = 128281012447429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128281012447497 and 128281012447506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128281012447657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21380168741257 + ... + 21380168741262.

It is an arithmetic number, because the mean of its divisors is an integer number (42760337482520).

Almost surely, 2^{128281012447557} is an apocalyptic number.

It is an amenable number.

128281012447557 is a deficient number, since it is larger than the sum of its proper divisors (42760337482523).

128281012447557 is an equidigital number, since it uses as much as digits as its factorization.

128281012447557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42760337482522.

The product of its (nonzero) digits is 10035200, while the sum is 57.

The spelling of 128281012447557 in words is "one hundred twenty-eight trillion, two hundred eighty-one billion, twelve million, four hundred forty-seven thousand, five hundred fifty-seven".