566667221993 has 2 divisors, whose sum is σ = 566667221994. Its totient is φ = 566667221992.

The previous prime is 566667221987. The next prime is 566667222007. The reversal of 566667221993 is 399122766665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 559702985689 + 6964236304 = 748133^2 + 83452^2 .

It is a cyclic number.

It is not a de Polignac number, because 566667221993 - 2²⁴ = 566650444777 is a prime.

It is a super-2 number, since 2×566667221993² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (566667221293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283333610996 + 283333610997.

It is an arithmetic number, because the mean of its divisors is an integer number (283333610997).

Almost surely, 2^566667221993 is an apocalyptic number.

It is an amenable number.

566667221993 is a deficient number, since it is larger than the sum of its proper divisors (1).

566667221993 is an equidigital number, since it uses as much as digits as its factorization.

566667221993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44089920, while the sum is 62.

The spelling of 566667221993 in words is "five hundred sixty-six billion, six hundred sixty-seven million, two hundred twenty-one thousand, nine hundred ninety-three".