128448712123 has 4 divisors (see below), whose sum is σ = 128515859208. Its totient is φ = 128381565040.

The previous prime is 128448712079. The next prime is 128448712129. The reversal of 128448712123 is 321217844821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128448712123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128448712123.

It is not an unprimeable number, because it can be changed into a prime (128448712129) 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, 33570673 + ... + 33574498.

It is an arithmetic number, because the mean of its divisors is an integer number (32128964802).

Almost surely, 2^128448712123 is an apocalyptic number.

128448712123 is a deficient number, since it is larger than the sum of its proper divisors (67147085).

128448712123 is an equidigital number, since it uses as much as digits as its factorization.

128448712123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67147084.

The product of its digits is 172032, while the sum is 43.

The spelling of 128448712123 in words is "one hundred twenty-eight billion, four hundred forty-eight million, seven hundred twelve thousand, one hundred twenty-three".