255755781 has 6 divisors (see below), whose sum is σ = 369425030. Its totient is φ = 170503848.

The previous prime is 255755779. The next prime is 255755813. The reversal of 255755781 is 187557552.

255755781 is a `hidden beast` number, since 2 + 5 + 5 + 75 + 578 + 1 = 666.

255755781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 229068225 + 26687556 = 15135^2 + 5166^2 .

It is not a de Polignac number, because 255755781 - 2¹ = 255755779 is a prime.

It is a super-2 number, since 2×255755781² = 130822039029839922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255755741) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14208646 + ... + 14208663.

Almost surely, 2^255755781 is an apocalyptic number.

It is an amenable number.

255755781 is a deficient number, since it is larger than the sum of its proper divisors (113669249).

255755781 is a wasteful number, since it uses less digits than its factorization.

255755781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28417315 (or 28417312 counting only the distinct ones).

The product of its digits is 490000, while the sum is 45.

The square root of 255755781 is about 15992.3663352238. The cubic root of 255755781 is about 634.7584432662.

The spelling of 255755781 in words is "two hundred fifty-five million, seven hundred fifty-five thousand, seven hundred eighty-one".