63645373116 has 72 divisors (see below), whose sum is σ = 173478001424. Its totient is φ = 19558195200.

The previous prime is 63645373061. The next prime is 63645373117. The reversal of 63645373116 is 61137354636.

63645373116 is a `hidden beast` number, since 636 + 4 + 5 + 3 + 7 + 3 + 1 + 1 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63645373117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281916 + ... + 454716.

Almost surely, 2^63645373116 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 63645373116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86739000712).

63645373116 is an abundant number, since it is smaller than the sum of its proper divisors (109832628308).

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

63645373116 is a wasteful number, since it uses less digits than its factorization.

63645373116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173611 (or 173606 counting only the distinct ones).

The product of its digits is 816480, while the sum is 45.

The spelling of 63645373116 in words is "sixty-three billion, six hundred forty-five million, three hundred seventy-three thousand, one hundred sixteen".