13446443749 has 4 divisors (see below), whose sum is σ = 13516114636. Its totient is φ = 13376772864.

The previous prime is 13446443741. The next prime is 13446443767. The reversal of 13446443749 is 94734464431.

13446443749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6635242849 + 6811200900 = 81457^2 + 82530^2 .

It is a cyclic number.

It is not a de Polignac number, because 13446443749 - 2³ = 13446443741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13446443741) 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 3 ways as a sum of consecutive naturals, for example, 34835154 + ... + 34835539.

It is an arithmetic number, because the mean of its divisors is an integer number (3379028659).

Almost surely, 2^13446443749 is an apocalyptic number.

It is an amenable number.

13446443749 is a deficient number, since it is larger than the sum of its proper divisors (69670887).

13446443749 is an equidigital number, since it uses as much as digits as its factorization.

13446443749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69670886.

The product of its digits is 3483648, while the sum is 49.

The spelling of 13446443749 in words is "thirteen billion, four hundred forty-six million, four hundred forty-three thousand, seven hundred forty-nine".