566721 has 6 divisors (see below), whose sum is σ = 818610. Its totient is φ = 377808.

The previous prime is 566719. The next prime is 566723. The reversal of 566721 is 127665.

It is an interprime number because it is at equal distance from previous prime (566719) and next prime (566723).

It can be written as a sum of positive squares in only one way, i.e., 497025 + 69696 = 705^2 + 264^2 .

It is not a de Polignac number, because 566721 - 2¹ = 566719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (566723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31476 + ... + 31493.

It is an arithmetic number, because the mean of its divisors is an integer number (136435).

2⁵⁶⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

566721 is a deficient number, since it is larger than the sum of its proper divisors (251889).

566721 is a wasteful number, since it uses less digits than its factorization.

566721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62975 (or 62972 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 566721 is about 752.8087406506. The cubic root of 566721 is about 82.7541474055.

The spelling of 566721 in words is "five hundred sixty-six thousand, seven hundred twenty-one".