63399988648 has 16 divisors (see below), whose sum is σ = 119965576500. Its totient is φ = 31409168256.

The previous prime is 63399988637. The next prime is 63399988657. The reversal of 63399988648 is 84688999336.

It can be written as a sum of positive squares in 2 ways, for example, as 61761196324 + 1638792324 = 248518^2 + 40482^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36352333 + ... + 36354076.

Almost surely, 2^63399988648 is an apocalyptic number.

It is an amenable number.

63399988648 is a deficient number, since it is larger than the sum of its proper divisors (56565587852).

63399988648 is a wasteful number, since it uses less digits than its factorization.

63399988648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72706524 (or 72706520 counting only the distinct ones).

The product of its digits is 483729408, while the sum is 73.

The spelling of 63399988648 in words is "sixty-three billion, three hundred ninety-nine million, nine hundred eighty-eight thousand, six hundred forty-eight".