448663778621 has 16 divisors (see below), whose sum is σ = 462928048128. Its totient is φ = 434607264000.

The previous prime is 448663778603. The next prime is 448663778639. The reversal of 448663778621 is 126877366844.

It is an interprime number because it is at equal distance from previous prime (448663778603) and next prime (448663778639).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-448663778621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (448663778681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3662756 + ... + 3783266.

It is an arithmetic number, because the mean of its divisors is an integer number (28933003008).

Almost surely, 2^448663778621 is an apocalyptic number.

It is an amenable number.

448663778621 is a deficient number, since it is larger than the sum of its proper divisors (14264269507).

448663778621 is a wasteful number, since it uses less digits than its factorization.

448663778621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121372.

The product of its digits is 65028096, while the sum is 62.

The spelling of 448663778621 in words is "four hundred forty-eight billion, six hundred sixty-three million, seven hundred seventy-eight thousand, six hundred twenty-one".