255817385 has 16 divisors (see below), whose sum is σ = 320785920. Its totient is φ = 195476160.

The previous prime is 255817369. The next prime is 255817391. The reversal of 255817385 is 583718552.

It is not a de Polignac number, because 255817385 - 2⁴ = 255817369 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118415 + ... + 120555.

It is an arithmetic number, because the mean of its divisors is an integer number (20049120).

Almost surely, 2^255817385 is an apocalyptic number.

It is an amenable number.

255817385 is a deficient number, since it is larger than the sum of its proper divisors (64968535).

255817385 is a wasteful number, since it uses less digits than its factorization.

255817385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3208.

The product of its digits is 336000, while the sum is 44.

The square root of 255817385 is about 15994.2922631794. The cubic root of 255817385 is about 634.8094040170.

The spelling of 255817385 in words is "two hundred fifty-five million, eight hundred seventeen thousand, three hundred eighty-five".