564265661 has 2 divisors, whose sum is σ = 564265662. Its totient is φ = 564265660.

The previous prime is 564265633. The next prime is 564265679. The reversal of 564265661 is 166562465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 298771225 + 265494436 = 17285^2 + 16294^2 .

It is a cyclic number.

It is not a de Polignac number, because 564265661 - 2²⁶ = 497156797 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (564262661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282132830 + 282132831.

It is an arithmetic number, because the mean of its divisors is an integer number (282132831).

Almost surely, 2^564265661 is an apocalyptic number.

It is an amenable number.

564265661 is a deficient number, since it is larger than the sum of its proper divisors (1).

564265661 is an equidigital number, since it uses as much as digits as its factorization.

564265661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 41.

The square root of 564265661 is about 23754.2766886302. The cubic root of 564265661 is about 826.3446262479.

The spelling of 564265661 in words is "five hundred sixty-four million, two hundred sixty-five thousand, six hundred sixty-one".