255665109 has 16 divisors (see below), whose sum is σ = 391842432. Its totient is φ = 145247808.

The previous prime is 255664999. The next prime is 255665129. The reversal of 255665109 is 901566552.

It is not a de Polignac number, because 255665109 - 2⁹ = 255664597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255665129) 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 15 ways as a sum of consecutive naturals, for example, 31554 + ... + 38819.

It is an arithmetic number, because the mean of its divisors is an integer number (24490152).

Almost surely, 2^255665109 is an apocalyptic number.

It is an amenable number.

255665109 is a deficient number, since it is larger than the sum of its proper divisors (136177323).

255665109 is a wasteful number, since it uses less digits than its factorization.

255665109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70556.

The product of its (nonzero) digits is 81000, while the sum is 39.

The square root of 255665109 is about 15989.5312314026. The cubic root of 255665109 is about 634.6834216704.

The spelling of 255665109 in words is "two hundred fifty-five million, six hundred sixty-five thousand, one hundred nine".