128281038655537 has 4 divisors (see below), whose sum is σ = 128281167878436. Its totient is φ = 128280909432640.

The previous prime is 128281038655487. The next prime is 128281038655543. The reversal of 128281038655537 is 735556830182821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 92878110254241 + 35402928401296 = 9637329^2 + 5950036^2 .

It is a cyclic number.

It is not a de Polignac number, because 128281038655537 - 2¹⁹ = 128281038131249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128281038655577) 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 3 ways as a sum of consecutive naturals, for example, 63110764 + ... + 65111677.

It is an arithmetic number, because the mean of its divisors is an integer number (32070291969609).

Almost surely, 2^{128281038655537} is an apocalyptic number.

It is an amenable number.

128281038655537 is a deficient number, since it is larger than the sum of its proper divisors (129222899).

128281038655537 is a wasteful number, since it uses less digits than its factorization.

128281038655537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129222898.

The product of its (nonzero) digits is 96768000, while the sum is 64.

The spelling of 128281038655537 in words is "one hundred twenty-eight trillion, two hundred eighty-one billion, thirty-eight million, six hundred fifty-five thousand, five hundred thirty-seven".