506666 has 8 divisors (see below), whose sum is σ = 772644. Its totient is φ = 249120.

The previous prime is 506663. The next prime is 506683. The reversal of 506666 is 666605.

It can be written as a sum of positive squares in 2 ways, for example, as 326041 + 180625 = 571^2 + 425^2 .

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

506666 is a modest number, since divided by 666 gives 506 as remainder.

It is not an unprimeable number, because it can be changed into a prime (506663) 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, 1955 + ... + 2198.

2⁵⁰⁶⁶⁶⁶ is an apocalyptic number.

506666 is a deficient number, since it is larger than the sum of its proper divisors (265978).

506666 is a wasteful number, since it uses less digits than its factorization.

506666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216.

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

The square root of 506666 is about 711.8047485090. The cubic root of 506666 is about 79.7212171299.

The spelling of 506666 in words is "five hundred six thousand, six hundred sixty-six".