12221334647566 has 8 divisors (see below), whose sum is σ = 19998547605144. Its totient is φ = 5555152112520.

The previous prime is 12221334647531. The next prime is 12221334647597. The reversal of 12221334647566 is 66574643312221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×12221334647566³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277757605605 + ... + 277757605648.

It is an arithmetic number, because the mean of its divisors is an integer number (2499818450643).

Almost surely, 2^{12221334647566} is an apocalyptic number.

12221334647566 is a deficient number, since it is larger than the sum of its proper divisors (7777212957578).

12221334647566 is a wasteful number, since it uses less digits than its factorization.

12221334647566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555515211266.

The product of its digits is 8709120, while the sum is 52.

Adding to 12221334647566 its reverse (66574643312221), we get a palindrome (78795977959787).

The spelling of 12221334647566 in words is "twelve trillion, two hundred twenty-one billion, three hundred thirty-four million, six hundred forty-seven thousand, five hundred sixty-six".