505271666 has 8 divisors (see below), whose sum is σ = 782356224. Its totient is φ = 244486260.

The previous prime is 505271651. The next prime is 505271677. The reversal of 505271666 is 666172505.

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

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 in 3 ways as a sum of consecutive naturals, for example, 4074710 + ... + 4074833.

It is an arithmetic number, because the mean of its divisors is an integer number (97794528).

Almost surely, 2^505271666 is an apocalyptic number.

505271666 is a deficient number, since it is larger than the sum of its proper divisors (277084558).

505271666 is a wasteful number, since it uses less digits than its factorization.

505271666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8149576.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 505271666 is about 22478.2487307174. The cubic root of 505271666 is about 796.4801958100.

It can be divided in two parts, 505 and 271666, that multiplied together give a triangular number (137191330 = T₁₆₅₆₄).

The spelling of 505271666 in words is "five hundred five million, two hundred seventy-one thousand, six hundred sixty-six".