128003173720127 has 4 divisors (see below), whose sum is σ = 128003207418840. Its totient is φ = 128003140021416.

The previous prime is 128003173720109. The next prime is 128003173720223. The reversal of 128003173720127 is 721027371300821.

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

It is a cyclic number.

It is not a de Polignac number, because 128003173720127 - 2²⁴ = 128003156942911 is a prime.

It is a super-2 number, since 2×128003173720127² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128003173710127) 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, 10304168 + ... + 19031085.

It is an arithmetic number, because the mean of its divisors is an integer number (32000801854710).

Almost surely, 2^{128003173720127} is an apocalyptic number.

128003173720127 is a deficient number, since it is larger than the sum of its proper divisors (33698713).

128003173720127 is an equidigital number, since it uses as much as digits as its factorization.

128003173720127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33698712.

The product of its (nonzero) digits is 197568, while the sum is 44.

The spelling of 128003173720127 in words is "one hundred twenty-eight trillion, three billion, one hundred seventy-three million, seven hundred twenty thousand, one hundred twenty-seven".