128139651165 has 8 divisors (see below), whose sum is σ = 205023441888. Its totient is φ = 68341147280.

The previous prime is 128139651161. The next prime is 128139651181. The reversal of 128139651165 is 561156931821.

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

It is not a de Polignac number, because 128139651165 - 2² = 128139651161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128139651161) 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, 4271321691 + ... + 4271321720.

It is an arithmetic number, because the mean of its divisors is an integer number (25627930236).

Almost surely, 2^128139651165 is an apocalyptic number.

128139651165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128139651165 is a deficient number, since it is larger than the sum of its proper divisors (76883790723).

128139651165 is an equidigital number, since it uses as much as digits as its factorization.

128139651165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8542643419.

The product of its digits is 388800, while the sum is 48.

The spelling of 128139651165 in words is "one hundred twenty-eight billion, one hundred thirty-nine million, six hundred fifty-one thousand, one hundred sixty-five".