255657686177 has 2 divisors, whose sum is σ = 255657686178. Its totient is φ = 255657686176.

The previous prime is 255657686159. The next prime is 255657686183. The reversal of 255657686177 is 771686756552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247780946176 + 7876740001 = 497776^2 + 88751^2 .

It is a cyclic number.

It is not a de Polignac number, because 255657686177 - 2¹⁶ = 255657620641 is a prime.

It is not a weakly prime, because it can be changed into another prime (255657686117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127828843088 + 127828843089.

It is an arithmetic number, because the mean of its divisors is an integer number (127828843089).

Almost surely, 2^255657686177 is an apocalyptic number.

It is an amenable number.

255657686177 is a deficient number, since it is larger than the sum of its proper divisors (1).

255657686177 is an equidigital number, since it uses as much as digits as its factorization.

255657686177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176000, while the sum is 65.

The spelling of 255657686177 in words is "two hundred fifty-five billion, six hundred fifty-seven million, six hundred eighty-six thousand, one hundred seventy-seven".