128445544821 has 8 divisors (see below), whose sum is σ = 186829883424. Its totient is φ = 77845784720.

The previous prime is 128445544819. The next prime is 128445544831.

128445544821 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128445544821 - 2¹ = 128445544819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128445544831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1946144586 + ... + 1946144651.

It is an arithmetic number, because the mean of its divisors is an integer number (23353735428).

Almost surely, 2^128445544821 is an apocalyptic number.

128445544821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128445544821 is a deficient number, since it is larger than the sum of its proper divisors (58384338603).

128445544821 is a wasteful number, since it uses less digits than its factorization.

128445544821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3892289251.

The product of its digits is 1638400, while the sum is 48.

The spelling of 128445544821 in words is "one hundred twenty-eight billion, four hundred forty-five million, five hundred forty-four thousand, eight hundred twenty-one".