128716661311 has 12 divisors (see below), whose sum is σ = 150089005080. Its totient is φ = 110065235280.

The previous prime is 128716661267. The next prime is 128716661323. The reversal of 128716661311 is 113166617821.

It is a happy number.

It is not a de Polignac number, because 128716661311 - 2¹¹ = 128716659263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128716661911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3114160 + ... + 3155221.

It is an arithmetic number, because the mean of its divisors is an integer number (12507417090).

Almost surely, 2^128716661311 is an apocalyptic number.

128716661311 is a deficient number, since it is larger than the sum of its proper divisors (21372343769).

128716661311 is an equidigital number, since it uses as much as digits as its factorization.

128716661311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6269814 (or 6269807 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The spelling of 128716661311 in words is "one hundred twenty-eight billion, seven hundred sixteen million, six hundred sixty-one thousand, three hundred eleven".