128283536305881 has 56 divisors (see below), whose sum is σ = 210011743581120. Its totient is φ = 77677486336800.

The previous prime is 128283536305877. The next prime is 128283536305901. The reversal of 128283536305881 is 188503635382821.

It is a happy number.

128283536305881 is a `hidden beast` number, since 1 + 28 + 28 + 3 + 5 + 3 + 6 + 3 + 0 + 588 + 1 = 666.

It is not a de Polignac number, because 128283536305881 - 2² = 128283536305877 is a prime.

It is a super-3 number, since 3×128283536305881³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (128283536305831) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1680516 + ... + 16105626.

Almost surely, 2^{128283536305881} is an apocalyptic number.

128283536305881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128283536305881 is a deficient number, since it is larger than the sum of its proper divisors (81728207275239).

128283536305881 is a wasteful number, since it uses less digits than its factorization.

128283536305881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14426249 (or 14426234 counting only the distinct ones).

The product of its (nonzero) digits is 66355200, while the sum is 63.

The spelling of 128283536305881 in words is "one hundred twenty-eight trillion, two hundred eighty-three billion, five hundred thirty-six million, three hundred five thousand, eight hundred eighty-one".