128779015125 has 16 divisors (see below), whose sum is σ = 214288281792. Its totient is φ = 68682141200.

The previous prime is 128779015103. The next prime is 128779015129. The reversal of 128779015125 is 521510977821.

It is not a de Polignac number, because 128779015125 - 2¹³ = 128779006933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128779015129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171704979 + ... + 171705728.

It is an arithmetic number, because the mean of its divisors is an integer number (13393017612).

Almost surely, 2^128779015125 is an apocalyptic number.

128779015125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128779015125 is a deficient number, since it is larger than the sum of its proper divisors (85509266667).

128779015125 is an equidigital number, since it uses as much as digits as its factorization.

128779015125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343410725 (or 343410715 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 48.

The spelling of 128779015125 in words is "one hundred twenty-eight billion, seven hundred seventy-nine million, fifteen thousand, one hundred twenty-five".