255755681 has 2 divisors, whose sum is σ = 255755682. Its totient is φ = 255755680.

The previous prime is 255755659. The next prime is 255755723. The reversal of 255755681 is 186557552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237437281 + 18318400 = 15409^2 + 4280^2 .

It is a cyclic number.

It is not a de Polignac number, because 255755681 - 2²⁶ = 188646817 is a prime.

It is a super-2 number, since 2×255755681² = 130821936727547522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255755881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127877840 + 127877841.

It is an arithmetic number, because the mean of its divisors is an integer number (127877841).

Almost surely, 2^255755681 is an apocalyptic number.

It is an amenable number.

255755681 is a deficient number, since it is larger than the sum of its proper divisors (1).

255755681 is an equidigital number, since it uses as much as digits as its factorization.

255755681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 420000, while the sum is 44.

The square root of 255755681 is about 15992.3632087318. The cubic root of 255755681 is about 634.7583605364.

The spelling of 255755681 in words is "two hundred fifty-five million, seven hundred fifty-five thousand, six hundred eighty-one".