255969805 has 64 divisors (see below), whose sum is σ = 412070400. Its totient is φ = 148055040.

The previous prime is 255969803. The next prime is 255969809. The reversal of 255969805 is 508969552.

It is not a de Polignac number, because 255969805 - 2¹ = 255969803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255969803) 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 63 ways as a sum of consecutive naturals, for example, 250195 + ... + 251215.

It is an arithmetic number, because the mean of its divisors is an integer number (6438600).

Almost surely, 2^255969805 is an apocalyptic number.

It is an amenable number.

255969805 is a deficient number, since it is larger than the sum of its proper divisors (156100595).

255969805 is a wasteful number, since it uses less digits than its factorization.

255969805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094.

The product of its (nonzero) digits is 972000, while the sum is 49.

The square root of 255969805 is about 15999.0563784243. The cubic root of 255969805 is about 634.9354554439.

The spelling of 255969805 in words is "two hundred fifty-five million, nine hundred sixty-nine thousand, eight hundred five".