255242666 has 24 divisors (see below), whose sum is σ = 452684196. Its totient is φ = 107593920.

The previous prime is 255242639. The next prime is 255242683. The reversal of 255242666 is 666242552.

It can be written as a sum of positive squares in 2 ways, for example, as 195412441 + 59830225 = 13979^2 + 7735^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15371 + ... + 27326.

Almost surely, 2^255242666 is an apocalyptic number.

255242666 is a deficient number, since it is larger than the sum of its proper divisors (197441530).

255242666 is a wasteful number, since it uses less digits than its factorization.

255242666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42774 (or 42767 counting only the distinct ones).

The product of its digits is 172800, while the sum is 38.

The square root of 255242666 is about 15976.3157830584. The cubic root of 255242666 is about 634.3336602471. Note that the first 3 decimals are identical.

The spelling of 255242666 in words is "two hundred fifty-five million, two hundred forty-two thousand, six hundred sixty-six".