6444666248 has 8 divisors (see below), whose sum is σ = 12083749230. Its totient is φ = 3222333120.

The previous prime is 6444666247. The next prime is 6444666313. The reversal of 6444666248 is 8426664446.

It can be written as a sum of positive squares in only one way, i.e., 6441346564 + 3319684 = 80258^2 + 1822^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×6444666248² = 83067446096220795008, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6444666196 and 6444666205.

It is not an unprimeable number, because it can be changed into a prime (6444666247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402791633 + ... + 402791648.

Almost surely, 2^6444666248 is an apocalyptic number.

It is an amenable number.

6444666248 is a deficient number, since it is larger than the sum of its proper divisors (5639082982).

6444666248 is a wasteful number, since it uses less digits than its factorization.

6444666248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805583287 (or 805583283 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 50.

The square root of 6444666248 is about 80278.6786637648. The cubic root of 6444666248 is about 1860.9447399333.

The spelling of 6444666248 in words is "six billion, four hundred forty-four million, six hundred sixty-six thousand, two hundred forty-eight".