128178635777 has 2 divisors, whose sum is σ = 128178635778. Its totient is φ = 128178635776.

The previous prime is 128178635701. The next prime is 128178635797. The reversal of 128178635777 is 777536871821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128166864016 + 11771761 = 358004^2 + 3431^2 .

It is a cyclic number.

It is not a de Polignac number, because 128178635777 - 2²⁸ = 127910200321 is a prime.

It is not a weakly prime, because it can be changed into another prime (128178635797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64089317888 + 64089317889.

It is an arithmetic number, because the mean of its divisors is an integer number (64089317889).

Almost surely, 2^128178635777 is an apocalyptic number.

It is an amenable number.

128178635777 is a deficient number, since it is larger than the sum of its proper divisors (1).

128178635777 is an equidigital number, since it uses as much as digits as its factorization.

128178635777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27659520, while the sum is 62.

The spelling of 128178635777 in words is "one hundred twenty-eight billion, one hundred seventy-eight million, six hundred thirty-five thousand, seven hundred seventy-seven".