13644574646849 has 2 divisors, whose sum is σ = 13644574646850. Its totient is φ = 13644574646848.

The previous prime is 13644574646803. The next prime is 13644574646881. The reversal of 13644574646849 is 94864647544631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13045857729025 + 598716917824 = 3611905^2 + 773768^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13644574646849 is a prime.

It is not a weakly prime, because it can be changed into another prime (13644574642849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6822287323424 + 6822287323425.

It is an arithmetic number, because the mean of its divisors is an integer number (6822287323425).

Almost surely, 2^{13644574646849} is an apocalyptic number.

It is an amenable number.

13644574646849 is a deficient number, since it is larger than the sum of its proper divisors (1).

13644574646849 is an equidigital number, since it uses as much as digits as its factorization.

13644574646849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1672151040, while the sum is 71.

The spelling of 13644574646849 in words is "thirteen trillion, six hundred forty-four billion, five hundred seventy-four million, six hundred forty-six thousand, eight hundred forty-nine".