128516812791 has 8 divisors (see below), whose sum is σ = 173052342384. Its totient is φ = 84829579200.

The previous prime is 128516812733. The next prime is 128516812849. The reversal of 128516812791 is 197218615821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128516812733) and next prime (128516812849).

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

It is not a de Polignac number, because 128516812791 - 2¹³ = 128516804599 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128516812591) 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, 212073646 + ... + 212074251.

It is an arithmetic number, because the mean of its divisors is an integer number (21631542798).

Almost surely, 2^128516812791 is an apocalyptic number.

128516812791 is a deficient number, since it is larger than the sum of its proper divisors (44535529593).

128516812791 is a wasteful number, since it uses less digits than its factorization.

128516812791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424148001.

The product of its digits is 483840, while the sum is 51.

The spelling of 128516812791 in words is "one hundred twenty-eight billion, five hundred sixteen million, eight hundred twelve thousand, seven hundred ninety-one".