566661331 has 2 divisors, whose sum is σ = 566661332. Its totient is φ = 566661330.

The previous prime is 566661299. The next prime is 566661343. The reversal of 566661331 is 133166665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 566661331 - 2⁵ = 566661299 is a prime.

It is a super-2 number, since 2×566661331² = 642210128101383122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (566664331) by changing a digit.

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 as a sum of consecutive naturals, namely, 283330665 + 283330666.

It is an arithmetic number, because the mean of its divisors is an integer number (283330666).

Almost surely, 2^566661331 is an apocalyptic number.

566661331 is a deficient number, since it is larger than the sum of its proper divisors (1).

566661331 is an equidigital number, since it uses as much as digits as its factorization.

566661331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 37.

The square root of 566661331 is about 23804.6493567958. The cubic root of 566661331 is about 827.5124296013.

The spelling of 566661331 in words is "five hundred sixty-six million, six hundred sixty-one thousand, three hundred thirty-one".