63939278718 has 256 divisors, whose sum is σ = 174193459200. Its totient is φ = 16997713920.

The previous prime is 63939278657. The next prime is 63939278719. The reversal of 63939278718 is 81787293936.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63939278719) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 38586546 + ... + 38588202.

It is an arithmetic number, because the mean of its divisors is an integer number (680443200).

Almost surely, 2^63939278718 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63939278718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87096729600).

63939278718 is an abundant number, since it is smaller than the sum of its proper divisors (110254180482).

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

63939278718 is a wasteful number, since it uses less digits than its factorization.

63939278718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832 (or 1826 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 63.

The spelling of 63939278718 in words is "sixty-three billion, nine hundred thirty-nine million, two hundred seventy-eight thousand, seven hundred eighteen".