63448821520 has 80 divisors (see below), whose sum is σ = 170139467520. Its totient is φ = 21554284032.

The previous prime is 63448821509. The next prime is 63448821617. The reversal of 63448821520 is 2512884436.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×63448821520² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 458692 + ... + 580771.

It is an arithmetic number, because the mean of its divisors is an integer number (2126743344).

Almost surely, 2^63448821520 is an apocalyptic number.

It is an amenable number.

63448821520 is an abundant number, since it is smaller than the sum of its proper divisors (106690646000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63448821520 is a wasteful number, since it uses less digits than its factorization.

63448821520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039592 (or 1039586 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 63448821520 in words is "sixty-three billion, four hundred forty-eight million, eight hundred twenty-one thousand, five hundred twenty".