13644023178321 has 6 divisors (see below), whose sum is σ = 19708033479810. Its totient is φ = 9096015452208.

The previous prime is 13644023178307. The next prime is 13644023178329. The reversal of 13644023178321 is 12387132044631.

It is a happy number.

13644023178321 is a `hidden beast` number, since 1 + 3 + 6 + 4 + 4 + 0 + 2 + 317 + 8 + 321 = 666.

13644023178321 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 only one way, i.e., 10811180737296 + 2832842441025 = 3288036^2 + 1683105^2 .

It is not a de Polignac number, because 13644023178321 - 2¹⁸ = 13644022916177 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13644023178329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 758001287676 + ... + 758001287693.

It is an arithmetic number, because the mean of its divisors is an integer number (3284672246635).

Almost surely, 2^{13644023178321} is an apocalyptic number.

It is an amenable number.

13644023178321 is a deficient number, since it is larger than the sum of its proper divisors (6064010301489).

13644023178321 is a wasteful number, since it uses less digits than its factorization.

13644023178321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516002575375 (or 1516002575372 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 13644023178321 in words is "thirteen trillion, six hundred forty-four billion, twenty-three million, one hundred seventy-eight thousand, three hundred twenty-one".