13681439145449 has 4 divisors (see below), whose sum is σ = 13789167012864. Its totient is φ = 13573711278036.

The previous prime is 13681439145427. The next prime is 13681439145457. The reversal of 13681439145449 is 94454193418631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13681439145449 - 2⁸ = 13681439145193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13681439145391 and 13681439145400.

It is not an unprimeable number, because it can be changed into a prime (13681439147449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53863933517 + ... + 53863933770.

It is an arithmetic number, because the mean of its divisors is an integer number (3447291753216).

Almost surely, 2^{13681439145449} is an apocalyptic number.

It is an amenable number.

13681439145449 is a deficient number, since it is larger than the sum of its proper divisors (107727867415).

13681439145449 is a wasteful number, since it uses less digits than its factorization.

13681439145449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107727867414.

The product of its digits is 44789760, while the sum is 62.

The spelling of 13681439145449 in words is "thirteen trillion, six hundred eighty-one billion, four hundred thirty-nine million, one hundred forty-five thousand, four hundred forty-nine".