255787681109 has 2 divisors, whose sum is σ = 255787681110. Its totient is φ = 255787681108.

The previous prime is 255787681063. The next prime is 255787681133. The reversal of 255787681109 is 901186787552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242590726225 + 13196954884 = 492535^2 + 114878^2 .

It is a cyclic number.

It is not a de Polignac number, because 255787681109 - 2²⁰ = 255786632533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255787681169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127893840554 + 127893840555.

It is an arithmetic number, because the mean of its divisors is an integer number (127893840555).

Almost surely, 2^255787681109 is an apocalyptic number.

It is an amenable number.

255787681109 is a deficient number, since it is larger than the sum of its proper divisors (1).

255787681109 is an equidigital number, since it uses as much as digits as its factorization.

255787681109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8467200, while the sum is 59.

The spelling of 255787681109 in words is "two hundred fifty-five billion, seven hundred eighty-seven million, six hundred eighty-one thousand, one hundred nine".