6448521943 has 4 divisors (see below), whose sum is σ = 6605803008. Its totient is φ = 6291240880.

The previous prime is 6448521917. The next prime is 6448521953. The reversal of 6448521943 is 3491258446.

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

It is a cyclic number.

It is not a de Polignac number, because 6448521943 - 2¹³ = 6448513751 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6448521893 and 6448521902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6448521953) 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, 78640471 + ... + 78640552.

It is an arithmetic number, because the mean of its divisors is an integer number (1651450752).

Almost surely, 2^6448521943 is an apocalyptic number.

6448521943 is a deficient number, since it is larger than the sum of its proper divisors (157281065).

6448521943 is a wasteful number, since it uses less digits than its factorization.

6448521943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157281064.

The product of its digits is 829440, while the sum is 46.

The square root of 6448521943 is about 80302.6895128675. The cubic root of 6448521943 is about 1861.3157860357.

The spelling of 6448521943 in words is "six billion, four hundred forty-eight million, five hundred twenty-one thousand, nine hundred forty-three".