255808645 has 16 divisors (see below), whose sum is σ = 323326080. Its totient is φ = 193910464.

The previous prime is 255808633. The next prime is 255808649. The reversal of 255808645 is 546808552.

It is a cyclic number.

It is not a de Polignac number, because 255808645 - 2¹³ = 255800453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255808649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1911 + ... + 22699.

It is an arithmetic number, because the mean of its divisors is an integer number (20207880).

Almost surely, 2^255808645 is an apocalyptic number.

It is an amenable number.

255808645 is a deficient number, since it is larger than the sum of its proper divisors (67517435).

255808645 is a wasteful number, since it uses less digits than its factorization.

255808645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20924.

The product of its (nonzero) digits is 384000, while the sum is 43.

The square root of 255808645 is about 15994.0190383781. The cubic root of 255808645 is about 634.8021745144.

It can be divided in two parts, 25580 and 8645, that added together give a square (34225 = 185²).

The spelling of 255808645 in words is "two hundred fifty-five million, eight hundred eight thousand, six hundred forty-five".