128879567713 has 4 divisors (see below), whose sum is σ = 138793380628. Its totient is φ = 118965754800.

The previous prime is 128879567701. The next prime is 128879567767. The reversal of 128879567713 is 317765978821.

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

It can be written as a sum of positive squares in 2 ways, for example, as 73328848849 + 55550718864 = 270793^2 + 235692^2 .

It is a cyclic number.

It is not a de Polignac number, because 128879567713 - 2⁵ = 128879567681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128879564713) 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, 4956906438 + ... + 4956906463.

It is an arithmetic number, because the mean of its divisors is an integer number (34698345157).

Almost surely, 2^128879567713 is an apocalyptic number.

128879567713 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

128879567713 is a deficient number, since it is larger than the sum of its proper divisors (9913812915).

128879567713 is an equidigital number, since it uses as much as digits as its factorization.

128879567713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9913812914.

The product of its digits is 35562240, while the sum is 64.

The spelling of 128879567713 in words is "one hundred twenty-eight billion, eight hundred seventy-nine million, five hundred sixty-seven thousand, seven hundred thirteen".