128056413681 has 24 divisors (see below), whose sum is σ = 211899280320. Its totient is φ = 73000436256.

The previous prime is 128056413671. The next prime is 128056413707. The reversal of 128056413681 is 186314650821.

128056413681 is a `hidden beast` number, since 1 + 2 + 8 + 0 + 564 + 1 + 3 + 6 + 81 = 666.

It is not a de Polignac number, because 128056413681 - 2⁵ = 128056413649 is a prime.

It is a super-2 number, since 2×128056413681² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128056413671) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2399190 + ... + 2451983.

It is an arithmetic number, because the mean of its divisors is an integer number (8829136680).

Almost surely, 2^128056413681 is an apocalyptic number.

It is an amenable number.

128056413681 is a deficient number, since it is larger than the sum of its proper divisors (83842866639).

128056413681 is a wasteful number, since it uses less digits than its factorization.

128056413681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4851605 (or 4851602 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 128056413681 in words is "one hundred twenty-eight billion, fifty-six million, four hundred thirteen thousand, six hundred eighty-one".