63721812736 has 36 divisors (see below), whose sum is σ = 128623912200. Its totient is φ = 31502907392.

The previous prime is 63721812719. The next prime is 63721812851.

It is a happy number.

63721812736 is nontrivially palindromic in base 10.

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 3 ways as a sum of consecutive naturals, for example, 1375606 + ... + 1421173.

It is an arithmetic number, because the mean of its divisors is an integer number (3572886450).

Almost surely, 2^63721812736 is an apocalyptic number.

It is an amenable number.

63721812736 is an abundant number, since it is smaller than the sum of its proper divisors (64902099464).

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

63721812736 is an equidigital number, since it uses as much as digits as its factorization.

63721812736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796884 (or 2796870 counting only the distinct ones).

The product of its digits is 508032, while the sum is 46.

The spelling of 63721812736 in words is "sixty-three billion, seven hundred twenty-one million, eight hundred twelve thousand, seven hundred thirty-six".