255657688189 has 2 divisors, whose sum is σ = 255657688190. Its totient is φ = 255657688188.

The previous prime is 255657688171. The next prime is 255657688243. The reversal of 255657688189 is 981886756552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241220464164 + 14437224025 = 491142^2 + 120155^2 .

It is a cyclic number.

It is not a de Polignac number, because 255657688189 - 2¹³ = 255657679997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255657688159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127828844094 + 127828844095.

It is an arithmetic number, because the mean of its divisors is an integer number (127828844095).

Almost surely, 2^255657688189 is an apocalyptic number.

It is an amenable number.

255657688189 is a deficient number, since it is larger than the sum of its proper divisors (1).

255657688189 is an equidigital number, since it uses as much as digits as its factorization.

255657688189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304000, while the sum is 70.

The spelling of 255657688189 in words is "two hundred fifty-five billion, six hundred fifty-seven million, six hundred eighty-eight thousand, one hundred eighty-nine".