128179921756 has 12 divisors (see below), whose sum is σ = 224346098592. Its totient is φ = 64081036448.

The previous prime is 128179921741. The next prime is 128179921757. The reversal of 128179921756 is 657129971821.

It is a self number, because there is not a number n which added to its sum of digits gives 128179921756.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128179921757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2198740 + ... + 2256283.

It is an arithmetic number, because the mean of its divisors is an integer number (18695508216).

Almost surely, 2^128179921756 is an apocalyptic number.

It is an amenable number.

128179921756 is a deficient number, since it is larger than the sum of its proper divisors (96166176836).

128179921756 is a wasteful number, since it uses less digits than its factorization.

128179921756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4462220 (or 4462218 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 58.

The spelling of 128179921756 in words is "one hundred twenty-eight billion, one hundred seventy-nine million, nine hundred twenty-one thousand, seven hundred fifty-six".