666000506 has 8 divisors (see below), whose sum is σ = 999152820. Its totient is φ = 332949568.

The previous prime is 666000479. The next prime is 666000527. The reversal of 666000506 is 605000666.

It can be written as a sum of positive squares in 2 ways, for example, as 637815025 + 28185481 = 25255^2 + 5309^2 .

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, 5951 + ... + 36978.

Almost surely, 2^666000506 is an apocalyptic number.

666000506 is a deficient number, since it is larger than the sum of its proper divisors (333152314).

666000506 is a wasteful number, since it uses less digits than its factorization.

666000506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50688.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 666000506 is about 25806.9856046769. The cubic root of 666000506 is about 873.2893952929.

The spelling of 666000506 in words is "six hundred sixty-six million, five hundred six", and thus it is an aban number.