128694715927 has 4 divisors (see below), whose sum is σ = 128695447296. Its totient is φ = 128693984560.

The previous prime is 128694715909. The next prime is 128694715931. The reversal of 128694715927 is 729517496821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128694715927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128694715327) 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, 76458 + ... + 513064.

It is an arithmetic number, because the mean of its divisors is an integer number (32173861824).

Almost surely, 2^128694715927 is an apocalyptic number.

128694715927 is a deficient number, since it is larger than the sum of its proper divisors (731369).

128694715927 is an equidigital number, since it uses as much as digits as its factorization.

128694715927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731368.

The product of its digits is 15240960, while the sum is 61.

The spelling of 128694715927 in words is "one hundred twenty-eight billion, six hundred ninety-four million, seven hundred fifteen thousand, nine hundred twenty-seven".