255566491 has 8 divisors (see below), whose sum is σ = 270746064. Its totient is φ = 240403200.

The previous prime is 255566483. The next prime is 255566533. The reversal of 255566491 is 194665552.

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 255566491 - 2³ = 255566483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255566411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45831 + ... + 51103.

It is an arithmetic number, because the mean of its divisors is an integer number (33843258).

Almost surely, 2^255566491 is an apocalyptic number.

255566491 is a deficient number, since it is larger than the sum of its proper divisors (15179573).

255566491 is a wasteful number, since it uses less digits than its factorization.

255566491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8141.

The product of its digits is 324000, while the sum is 43.

The square root of 255566491 is about 15986.4471037188. The cubic root of 255566491 is about 634.6018054506.

The spelling of 255566491 in words is "two hundred fifty-five million, five hundred sixty-six thousand, four hundred ninety-one".