255888666 has 32 divisors (see below), whose sum is σ = 620337600. Its totient is φ = 77541840.

The previous prime is 255888643. The next prime is 255888679. The reversal of 255888666 is 666888552.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214801 + ... + 215988.

It is an arithmetic number, because the mean of its divisors is an integer number (19385550).

Almost surely, 2^255888666 is an apocalyptic number.

255888666 is an abundant number, since it is smaller than the sum of its proper divisors (364448934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255888666 is a wasteful number, since it uses less digits than its factorization.

255888666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430811 (or 430805 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 54.

The square root of 255888666 is about 15996.5204341444. The cubic root of 255888666 is about 634.8683596753.

The spelling of 255888666 in words is "two hundred fifty-five million, eight hundred eighty-eight thousand, six hundred sixty-six".