63646720368 has 80 divisors (see below), whose sum is σ = 204992046336. Its totient is φ = 16531614720.

The previous prime is 63646720367. The next prime is 63646720373. The reversal of 63646720368 is 86302764636.

63646720368 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 63646720368.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63646720367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8606521 + ... + 8613912.

Almost surely, 2^63646720368 is an apocalyptic number.

It is an amenable number.

63646720368 is an abundant number, since it is smaller than the sum of its proper divisors (141345325968).

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

63646720368 is a wasteful number, since it uses less digits than its factorization.

63646720368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17220462 (or 17220456 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 51.

The spelling of 63646720368 in words is "sixty-three billion, six hundred forty-six million, seven hundred twenty thousand, three hundred sixty-eight".