63640552416 has 144 divisors (see below), whose sum is σ = 194542798464. Its totient is φ = 18163197696.

The previous prime is 63640552387. The next prime is 63640552433. The reversal of 63640552416 is 61425504636.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 4617151 + ... + 4630913.

It is an arithmetic number, because the mean of its divisors is an integer number (1350991656).

Almost surely, 2^63640552416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63640552416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97271399232).

63640552416 is an abundant number, since it is smaller than the sum of its proper divisors (130902246048).

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

63640552416 is a wasteful number, since it uses less digits than its factorization.

63640552416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14773 (or 14758 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 63640552416 in words is "sixty-three billion, six hundred forty million, five hundred fifty-two thousand, four hundred sixteen".