566648021 has 4 divisors (see below), whose sum is σ = 568664844. Its totient is φ = 564631200.

The previous prime is 566648009. The next prime is 566648053. The reversal of 566648021 is 120846665.

566648021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 403447396 + 163200625 = 20086^2 + 12775^2 .

It is a cyclic number.

It is not a de Polignac number, because 566648021 - 2⁶ = 566647957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (566648521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1007990 + ... + 1008551.

It is an arithmetic number, because the mean of its divisors is an integer number (142166211).

Almost surely, 2^566648021 is an apocalyptic number.

It is an amenable number.

566648021 is a deficient number, since it is larger than the sum of its proper divisors (2016823).

566648021 is a wasteful number, since it uses less digits than its factorization.

566648021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016822.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 566648021 is about 23804.3697879192. The cubic root of 566648021 is about 827.5059505540.

The spelling of 566648021 in words is "five hundred sixty-six million, six hundred forty-eight thousand, twenty-one".