255581650817 has 4 divisors (see below), whose sum is σ = 264394811220. Its totient is φ = 246768490416.

The previous prime is 255581650799. The next prime is 255581650867. The reversal of 255581650817 is 718056185552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 194413973776 + 61167677041 = 440924^2 + 247321^2 .

It is a cyclic number.

It is not a de Polignac number, because 255581650817 - 2³² = 251286683521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255581650867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4406580158 + ... + 4406580215.

It is an arithmetic number, because the mean of its divisors is an integer number (66098702805).

Almost surely, 2^255581650817 is an apocalyptic number.

It is an amenable number.

255581650817 is a deficient number, since it is larger than the sum of its proper divisors (8813160403).

255581650817 is an equidigital number, since it uses as much as digits as its factorization.

255581650817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8813160402.

The product of its (nonzero) digits is 3360000, while the sum is 53.

The spelling of 255581650817 in words is "two hundred fifty-five billion, five hundred eighty-one million, six hundred fifty thousand, eight hundred seventeen".