13644041021266 has 16 divisors (see below), whose sum is σ = 20513428056000. Its totient is φ = 6806232801648.

The previous prime is 13644041021131. The next prime is 13644041021311. The reversal of 13644041021266 is 66212014044631.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25148821 + ... + 25685623.

It is an arithmetic number, because the mean of its divisors is an integer number (1282089253500).

Almost surely, 2^{13644041021266} is an apocalyptic number.

13644041021266 is a deficient number, since it is larger than the sum of its proper divisors (6869387034734).

13644041021266 is a wasteful number, since it uses less digits than its factorization.

13644041021266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566193.

The product of its (nonzero) digits is 165888, while the sum is 40.

Adding to 13644041021266 its reverse (66212014044631), we get a palindrome (79856055065897).

The spelling of 13644041021266 in words is "thirteen trillion, six hundred forty-four billion, forty-one million, twenty-one thousand, two hundred sixty-six".