255506866 has 4 divisors (see below), whose sum is σ = 383260302. Its totient is φ = 127753432.

The previous prime is 255506843. The next prime is 255506873. The reversal of 255506866 is 668605552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 177555625 + 77951241 = 13325^2 + 8829^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63876715 + ... + 63876718.

Almost surely, 2^255506866 is an apocalyptic number.

255506866 is a deficient number, since it is larger than the sum of its proper divisors (127753436).

255506866 is a wasteful number, since it uses less digits than its factorization.

255506866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127753435.

The product of its (nonzero) digits is 432000, while the sum is 43.

The square root of 255506866 is about 15984.5821340440. The cubic root of 255506866 is about 634.5524496378.

The spelling of 255506866 in words is "two hundred fifty-five million, five hundred six thousand, eight hundred sixty-six".