255818803861 has 8 divisors (see below), whose sum is σ = 277473480984. Its totient is φ = 234898183680.

The previous prime is 255818803837. The next prime is 255818803871. The reversal of 255818803861 is 168308818552.

It can be written as a sum of positive squares in 4 ways, for example, as 38821214961 + 216997588900 = 197031^2 + 465830^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 255818803861 - 2⁹ = 255818803349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255818803871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183513510 + ... + 183514903.

It is an arithmetic number, because the mean of its divisors is an integer number (34684185123).

Almost surely, 2^255818803861 is an apocalyptic number.

It is an amenable number.

255818803861 is a deficient number, since it is larger than the sum of its proper divisors (21654677123).

255818803861 is a wasteful number, since it uses less digits than its factorization.

255818803861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367028471.

The product of its (nonzero) digits is 3686400, while the sum is 55.

The spelling of 255818803861 in words is "two hundred fifty-five billion, eight hundred eighteen million, eight hundred three thousand, eight hundred sixty-one".