520666 has 16 divisors (see below), whose sum is σ = 829440. Its totient is φ = 244720.

The previous prime is 520649. The next prime is 520679. The reversal of 520666 is 666025.

520666 is a modest number, since divided by 666 gives 520 as remainder.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 520666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2631 + ... + 2821.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2⁵²⁰⁶⁶⁶ is an apocalyptic number.

520666 is a deficient number, since it is larger than the sum of its proper divisors (308774).

520666 is a wasteful number, since it uses less digits than its factorization.

520666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 520666 is about 721.5718952398. The cubic root of 520666 is about 80.4488313378.

The spelling of 520666 in words is "five hundred twenty thousand, six hundred sixty-six".