13644456660 has 36 divisors (see below), whose sum is σ = 41388185748. Its totient is φ = 3638521728.

The previous prime is 13644456641. The next prime is 13644456667. The reversal of 13644456660 is 6665444631.

13644456660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6194004804 + 7450451856 = 78702^2 + 86316^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13644456667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37901089 + ... + 37901448.

Almost surely, 2^13644456660 is an apocalyptic number.

13644456660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13644456660 is an abundant number, since it is smaller than the sum of its proper divisors (27743729088).

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

13644456660 is a wasteful number, since it uses less digits than its factorization.

13644456660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75802552 (or 75802547 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 13644456660 in words is "thirteen billion, six hundred forty-four million, four hundred fifty-six thousand, six hundred sixty".