566665601 has 2 divisors, whose sum is σ = 566665602. Its totient is φ = 566665600.

The previous prime is 566665591. The next prime is 566665669. The reversal of 566665601 is 106566665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549855601 + 16810000 = 23449^2 + 4100^2 .

It is a cyclic number.

It is not a de Polignac number, because 566665601 - 2¹⁸ = 566403457 is a prime.

It is a super-2 number, since 2×566665601² = 642219806713382402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (566664601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283332800 + 283332801.

It is an arithmetic number, because the mean of its divisors is an integer number (283332801).

Almost surely, 2^566665601 is an apocalyptic number.

It is an amenable number.

566665601 is a deficient number, since it is larger than the sum of its proper divisors (1).

566665601 is an equidigital number, since it uses as much as digits as its factorization.

566665601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 566665601 is about 23804.7390449885. The cubic root of 566665601 is about 827.5145081321.

The spelling of 566665601 in words is "five hundred sixty-six million, six hundred sixty-five thousand, six hundred one".