128173449653 has 4 divisors (see below), whose sum is σ = 128183625888. Its totient is φ = 128163273420.

The previous prime is 128173449641. The next prime is 128173449667. The reversal of 128173449653 is 356944371821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 356944371821 = 1669 ⋅213867209.

It is a cyclic number.

It is not a de Polignac number, because 128173449653 - 2¹⁰ = 128173448629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128173449595 and 128173449604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128173449253) 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, 5069201 + ... + 5094422.

It is an arithmetic number, because the mean of its divisors is an integer number (32045906472).

Almost surely, 2^128173449653 is an apocalyptic number.

It is an amenable number.

128173449653 is a deficient number, since it is larger than the sum of its proper divisors (10176235).

128173449653 is a wasteful number, since it uses less digits than its factorization.

128173449653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10176234.

The product of its digits is 4354560, while the sum is 53.

The spelling of 128173449653 in words is "one hundred twenty-eight billion, one hundred seventy-three million, four hundred forty-nine thousand, six hundred fifty-three".