566667221999 has 4 divisors (see below), whose sum is σ = 566679069936. Its totient is φ = 566655374064.

The previous prime is 566667221993. The next prime is 566667222007. The reversal of 566667221999 is 999122766665.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-566667221999 is a prime.

It is a super-2 number, since 2×566667221999² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (566667221993) 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, 5851934 + ... + 5947979.

It is an arithmetic number, because the mean of its divisors is an integer number (141669767484).

Almost surely, 2^566667221999 is an apocalyptic number.

566667221999 is a deficient number, since it is larger than the sum of its proper divisors (11847937).

566667221999 is a wasteful number, since it uses less digits than its factorization.

566667221999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11847936.

The product of its digits is 132269760, while the sum is 68.

The spelling of 566667221999 in words is "five hundred sixty-six billion, six hundred sixty-seven million, two hundred twenty-one thousand, nine hundred ninety-nine".