13644636344 has 8 divisors (see below), whose sum is σ = 25583693160. Its totient is φ = 6822318168.

The previous prime is 13644636337. The next prime is 13644636349. The reversal of 13644636344 is 44363644631.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×13644636344² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13644636295 and 13644636304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13644636349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 852789764 + ... + 852789779.

It is an arithmetic number, because the mean of its divisors is an integer number (3197961645).

Almost surely, 2^13644636344 is an apocalyptic number.

It is an amenable number.

13644636344 is a deficient number, since it is larger than the sum of its proper divisors (11939056816).

13644636344 is a wasteful number, since it uses less digits than its factorization.

13644636344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705579549 (or 1705579545 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 44.

The spelling of 13644636344 in words is "thirteen billion, six hundred forty-four million, six hundred thirty-six thousand, three hundred forty-four".