22065566217 has 4 divisors (see below), whose sum is σ = 29420754960. Its totient is φ = 14710377476.

The previous prime is 22065566207. The next prime is 22065566221. The reversal of 22065566217 is 71266556022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22065566217 - 2⁸ = 22065565961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22065566207) 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, 3677594367 + ... + 3677594372.

It is an arithmetic number, because the mean of its divisors is an integer number (7355188740).

Almost surely, 2^22065566217 is an apocalyptic number.

It is an amenable number.

22065566217 is a deficient number, since it is larger than the sum of its proper divisors (7355188743).

22065566217 is an equidigital number, since it uses as much as digits as its factorization.

22065566217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7355188742.

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 22065566217 in words is "twenty-two billion, sixty-five million, five hundred sixty-six thousand, two hundred seventeen".