13644535453849 has 2 divisors, whose sum is σ = 13644535453850. Its totient is φ = 13644535453848.

The previous prime is 13644535453817. The next prime is 13644535453867. The reversal of 13644535453849 is 94835453544631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13580463188224 + 64072265625 = 3685168^2 + 253125^2 .

It is a cyclic number.

It is not a de Polignac number, because 13644535453849 - 2⁵ = 13644535453817 is a prime.

It is a super-3 number, since 3×13644535453849³ (a number of 40 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (13644535453889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6822267726924 + 6822267726925.

It is an arithmetic number, because the mean of its divisors is an integer number (6822267726925).

Almost surely, 2^{13644535453849} is an apocalyptic number.

It is an amenable number.

13644535453849 is a deficient number, since it is larger than the sum of its proper divisors (1).

13644535453849 is an equidigital number, since it uses as much as digits as its factorization.

13644535453849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248000, while the sum is 64.

The spelling of 13644535453849 in words is "thirteen trillion, six hundred forty-four billion, five hundred thirty-five million, four hundred fifty-three thousand, eight hundred forty-nine".