6449113681921 has 4 divisors (see below), whose sum is σ = 6449236830144. Its totient is φ = 6448990533700.

The previous prime is 6449113681903. The next prime is 6449113681949. The reversal of 6449113681921 is 1291863119446.

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 6449113681921 - 2⁵ = 6449113681889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6449113681961) 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, 61495525 + ... + 61600306.

It is an arithmetic number, because the mean of its divisors is an integer number (1612309207536).

Almost surely, 2^{6449113681921} is an apocalyptic number.

It is an amenable number.

6449113681921 is a deficient number, since it is larger than the sum of its proper divisors (123148223).

6449113681921 is a wasteful number, since it uses less digits than its factorization.

6449113681921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123148222.

The product of its digits is 2239488, while the sum is 55.

The spelling of 6449113681921 in words is "six trillion, four hundred forty-nine billion, one hundred thirteen million, six hundred eighty-one thousand, nine hundred twenty-one".