566535821 has 2 divisors, whose sum is σ = 566535822. Its totient is φ = 566535820.

The previous prime is 566535803. The next prime is 566535841. The reversal of 566535821 is 128535665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 562353796 + 4182025 = 23714^2 + 2045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-566535821 is a prime.

It is a super-2 number, since 2×566535821² = 641925672952288082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (566535841) 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, 283267910 + 283267911.

It is an arithmetic number, because the mean of its divisors is an integer number (283267911).

Almost surely, 2^566535821 is an apocalyptic number.

It is an amenable number.

566535821 is a deficient number, since it is larger than the sum of its proper divisors (1).

566535821 is an equidigital number, since it uses as much as digits as its factorization.

566535821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216000, while the sum is 41.

The square root of 566535821 is about 23802.0129610922. The cubic root of 566535821 is about 827.4513297589.

The spelling of 566535821 in words is "five hundred sixty-six million, five hundred thirty-five thousand, eight hundred twenty-one".