128716661323 has 2 divisors, whose sum is σ = 128716661324. Its totient is φ = 128716661322.

The previous prime is 128716661267. The next prime is 128716661393. The reversal of 128716661323 is 323166617821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128716661323 - 2²⁹ = 128179790411 is a prime.

It is a super-2 number, since 2×128716661323² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128716661393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64358330661 + 64358330662.

It is an arithmetic number, because the mean of its divisors is an integer number (64358330662).

Almost surely, 2^128716661323 is an apocalyptic number.

128716661323 is a deficient number, since it is larger than the sum of its proper divisors (1).

128716661323 is an equidigital number, since it uses as much as digits as its factorization.

128716661323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 46.

The spelling of 128716661323 in words is "one hundred twenty-eight billion, seven hundred sixteen million, six hundred sixty-one thousand, three hundred twenty-three".