566661 has 16 divisors (see below), whose sum is σ = 822528. Its totient is φ = 345600.

The previous prime is 566659. The next prime is 566677. The reversal of 566661 is 166665.

It is not a de Polignac number, because 566661 - 2¹ = 566659 is a prime.

It is a super-2 number, since 2×566661² = 642209377842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (566681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1956 + ... + 2226.

It is an arithmetic number, because the mean of its divisors is an integer number (51408).

2⁵⁶⁶⁶⁶¹ is an apocalyptic number.

566661 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

566661 is a deficient number, since it is larger than the sum of its proper divisors (255867).

566661 is a wasteful number, since it uses less digits than its factorization.

566661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332.

The product of its digits is 6480, while the sum is 30.

The square root of 566661 is about 752.7688888364. The cubic root of 566661 is about 82.7512268478.

It can be divided in two parts, 5 and 66661, that added together give a palindrome (66666).

The spelling of 566661 in words is "five hundred sixty-six thousand, six hundred sixty-one".