128518646942726 has 24 divisors (see below), whose sum is σ = 198137096539200. Its totient is φ = 62520030794592.

The previous prime is 128518646942669. The next prime is 128518646942729. The reversal of 128518646942726 is 627249646815821.

It is a super-2 number, since 2×128518646942726² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128518646942726.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128518646942729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66953276 + ... + 68846048.

It is an arithmetic number, because the mean of its divisors is an integer number (8255712355800).

Almost surely, 2^{128518646942726} is an apocalyptic number.

128518646942726 is a deficient number, since it is larger than the sum of its proper divisors (69618449596474).

128518646942726 is a wasteful number, since it uses less digits than its factorization.

128518646942726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917648 (or 1917611 counting only the distinct ones).

The product of its digits is 557383680, while the sum is 71.

The spelling of 128518646942726 in words is "one hundred twenty-eight trillion, five hundred eighteen billion, six hundred forty-six million, nine hundred forty-two thousand, seven hundred twenty-six".