1226221200666 has 96 divisors (see below), whose sum is σ = 3318514482816. Its totient is φ = 317910096000.

The previous prime is 1226221200649. The next prime is 1226221200709. The reversal of 1226221200666 is 6660021226221.

It is a super-3 number, since 3×1226221200666³ (a number of 37 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1226221200666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67845 + ... + 1567496.

It is an arithmetic number, because the mean of its divisors is an integer number (34567859196).

Almost surely, 2^{1226221200666} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1226221200666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1659257241408).

1226221200666 is an abundant number, since it is smaller than the sum of its proper divisors (2092293282150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1226221200666 is a wasteful number, since it uses less digits than its factorization.

1226221200666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635908 (or 1635905 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

Adding to 1226221200666 its reverse (6660021226221), we get a palindrome (7886242426887).

The spelling of 1226221200666 in words is "one trillion, two hundred twenty-six billion, two hundred twenty-one million, two hundred thousand, six hundred sixty-six".