13644222244637 has 2 divisors, whose sum is σ = 13644222244638. Its totient is φ = 13644222244636.

The previous prime is 13644222244621. The next prime is 13644222244649. The reversal of 13644222244637 is 73644222244631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11932955356921 + 1711266887716 = 3454411^2 + 1308154^2 .

It is a cyclic number.

It is not a de Polignac number, because 13644222244637 - 2⁴ = 13644222244621 is a prime.

It is a super-2 number, since 2×13644222244637² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13644222244607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6822111122318 + 6822111122319.

It is an arithmetic number, because the mean of its divisors is an integer number (6822111122319).

Almost surely, 2^{13644222244637} is an apocalyptic number.

It is an amenable number.

13644222244637 is a deficient number, since it is larger than the sum of its proper divisors (1).

13644222244637 is an equidigital number, since it uses as much as digits as its factorization.

13644222244637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728, while the sum is 50.

The spelling of 13644222244637 in words is "thirteen trillion, six hundred forty-four billion, two hundred twenty-two million, two hundred forty-four thousand, six hundred thirty-seven".