566995981 has 2 divisors, whose sum is σ = 566995982. Its totient is φ = 566995980.

The previous prime is 566995963. The next prime is 566995993. The reversal of 566995981 is 189599665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 461605225 + 105390756 = 21485^2 + 10266^2 .

It is a cyclic number.

It is not a de Polignac number, because 566995981 - 2¹⁹ = 566471693 is a prime.

It is a super-2 number, since 2×566995981² = 642968884940304722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (566995901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283497990 + 283497991.

It is an arithmetic number, because the mean of its divisors is an integer number (283497991).

Almost surely, 2^566995981 is an apocalyptic number.

It is an amenable number.

566995981 is a deficient number, since it is larger than the sum of its proper divisors (1).

566995981 is an equidigital number, since it uses as much as digits as its factorization.

566995981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5248800, while the sum is 58.

The square root of 566995981 is about 23811.6774083642. The cubic root of 566995981 is about 827.6752973337.

The spelling of 566995981 in words is "five hundred sixty-six million, nine hundred ninety-five thousand, nine hundred eighty-one".