22215665729 has 4 divisors (see below), whose sum is σ = 22221116160. Its totient is φ = 22210215300.

The previous prime is 22215665699. The next prime is 22215665737. The reversal of 22215665729 is 92756651222.

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 22215665729 - 2²⁰ = 22214617153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22215665779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2719097 + ... + 2727254.

It is an arithmetic number, because the mean of its divisors is an integer number (5555279040).

Almost surely, 2^22215665729 is an apocalyptic number.

It is an amenable number.

22215665729 is a deficient number, since it is larger than the sum of its proper divisors (5450431).

22215665729 is an equidigital number, since it uses as much as digits as its factorization.

22215665729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5450430.

The product of its digits is 907200, while the sum is 47.

The spelling of 22215665729 in words is "twenty-two billion, two hundred fifteen million, six hundred sixty-five thousand, seven hundred twenty-nine".