255566666 has 8 divisors (see below), whose sum is σ = 395716224. Its totient is φ = 123661260.

The previous prime is 255566657. The next prime is 255566669. The reversal of 255566666 is 666665552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 255566666.

It is not an unprimeable number, because it can be changed into a prime (255566669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2060960 + ... + 2061083.

It is an arithmetic number, because the mean of its divisors is an integer number (49464528).

Almost surely, 2^255566666 is an apocalyptic number.

255566666 is a deficient number, since it is larger than the sum of its proper divisors (140149558).

255566666 is a wasteful number, since it uses less digits than its factorization.

255566666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4122076.

The product of its digits is 1944000, while the sum is 47.

The square root of 255566666 is about 15986.4525771042. The cubic root of 255566666 is about 634.6019502991.

The spelling of 255566666 in words is "two hundred fifty-five million, five hundred sixty-six thousand, six hundred sixty-six".