255691163 has 24 divisors (see below), whose sum is σ = 324434880. Its totient is φ = 199704960.

The previous prime is 255691157. The next prime is 255691223. The reversal of 255691163 is 361196552.

It is not a de Polignac number, because 255691163 - 2²⁴ = 238913947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255691103) 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 23 ways as a sum of consecutive naturals, for example, 47783 + ... + 52863.

It is an arithmetic number, because the mean of its divisors is an integer number (13518120).

Almost surely, 2^255691163 is an apocalyptic number.

255691163 is a deficient number, since it is larger than the sum of its proper divisors (68743717).

255691163 is a wasteful number, since it uses less digits than its factorization.

255691163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5187 (or 5180 counting only the distinct ones).

The product of its digits is 48600, while the sum is 38.

The square root of 255691163 is about 15990.3459312174. The cubic root of 255691163 is about 634.7049804460.

The spelling of 255691163 in words is "two hundred fifty-five million, six hundred ninety-one thousand, one hundred sixty-three".