255991068 has 36 divisors (see below), whose sum is σ = 656209008. Its totient is φ = 84127680.

The previous prime is 255991067. The next prime is 255991069. The reversal of 255991068 is 860199552.

255991068 is a `hidden beast` number, since 2 + 559 + 91 + 0 + 6 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (255991067) and next prime (255991069).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255991067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47521 + ... + 52632.

It is an arithmetic number, because the mean of its divisors is an integer number (18228028).

Almost surely, 2^255991068 is an apocalyptic number.

It is an amenable number.

255991068 is an abundant number, since it is smaller than the sum of its proper divisors (400217940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255991068 is a wasteful number, since it uses less digits than its factorization.

255991068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100234 (or 100229 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The square root of 255991068 is about 15999.7208725652. The cubic root of 255991068 is about 634.9530359794.

The spelling of 255991068 in words is "two hundred fifty-five million, nine hundred ninety-one thousand, sixty-eight".