128178635671 has 2 divisors, whose sum is σ = 128178635672. Its totient is φ = 128178635670.

The previous prime is 128178635647. The next prime is 128178635701. The reversal of 128178635671 is 176536871821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128178635671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128178635171) 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, 64089317835 + 64089317836.

It is an arithmetic number, because the mean of its divisors is an integer number (64089317836).

Almost surely, 2^128178635671 is an apocalyptic number.

128178635671 is a deficient number, since it is larger than the sum of its proper divisors (1).

128178635671 is an equidigital number, since it uses as much as digits as its factorization.

128178635671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 55.

The spelling of 128178635671 in words is "one hundred twenty-eight billion, one hundred seventy-eight million, six hundred thirty-five thousand, six hundred seventy-one".