566575661 has 2 divisors, whose sum is σ = 566575662. Its totient is φ = 566575660.

The previous prime is 566575657. The next prime is 566575663. The reversal of 566575661 is 166575665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 417589225 + 148986436 = 20435^2 + 12206^2 .

It is a cyclic number.

It is not a de Polignac number, because 566575661 - 2² = 566575657 is a prime.

Together with 566575663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (566575663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283287830 + 283287831.

It is an arithmetic number, because the mean of its divisors is an integer number (283287831).

Almost surely, 2^566575661 is an apocalyptic number.

It is an amenable number.

566575661 is a deficient number, since it is larger than the sum of its proper divisors (1).

566575661 is an equidigital number, since it uses as much as digits as its factorization.

566575661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134000, while the sum is 47.

The square root of 566575661 is about 23802.8498503856. The cubic root of 566575661 is about 827.4707253481.

The spelling of 566575661 in words is "five hundred sixty-six million, five hundred seventy-five thousand, six hundred sixty-one".