128032261640261 has 16 divisors (see below), whose sum is σ = 140257242316800. Its totient is φ = 115904903914800.

The previous prime is 128032261640237. The next prime is 128032261640273. The reversal of 128032261640261 is 162046162230821.

It is not a de Polignac number, because 128032261640261 - 2⁴⁶ = 57663517462597 is a prime.

It is a super-2 number, since 2×128032261640261² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128032261640201) 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, 502198220 + ... + 502453098.

It is an arithmetic number, because the mean of its divisors is an integer number (8766077644800).

Almost surely, 2^{128032261640261} is an apocalyptic number.

128032261640261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128032261640261 is a deficient number, since it is larger than the sum of its proper divisors (12224980676539).

128032261640261 is a wasteful number, since it uses less digits than its factorization.

128032261640261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446200.

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 128032261640261 in words is "one hundred twenty-eight trillion, thirty-two billion, two hundred sixty-one million, six hundred forty thousand, two hundred sixty-one".