6448743668 has 6 divisors (see below), whose sum is σ = 11285301426. Its totient is φ = 3224371832.

The previous prime is 6448743641. The next prime is 6448743683. The reversal of 6448743668 is 8663478446.

It can be written as a sum of positive squares in only one way, i.e., 4207857424 + 2240886244 = 64868^2 + 47338^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806092955 + ... + 806092962.

It is an arithmetic number, because the mean of its divisors is an integer number (1880883571).

Almost surely, 2^6448743668 is an apocalyptic number.

It is an amenable number.

6448743668 is a deficient number, since it is larger than the sum of its proper divisors (4836557758).

6448743668 is a wasteful number, since it uses less digits than its factorization.

6448743668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612185921 (or 1612185919 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 56.

The square root of 6448743668 is about 80304.0700587461. The cubic root of 6448743668 is about 1861.3371188578.

The spelling of 6448743668 in words is "six billion, four hundred forty-eight million, seven hundred forty-three thousand, six hundred sixty-eight".