639397319616 has 448 divisors, whose sum is σ = 2129571763200. Its totient is φ = 186424934400.

The previous prime is 639397319609. The next prime is 639397319647. The reversal of 639397319616 is 616913793936.

639397319616 is a `hidden beast` number, since 6 + 3 + 9 + 3 + 9 + 7 + 3 + 1 + 9 + 616 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 56885325 + ... + 56896563.

It is an arithmetic number, because the mean of its divisors is an integer number (4753508400).

Almost surely, 2^639397319616 is an apocalyptic number.

639397319616 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639397319616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1064785881600).

639397319616 is an abundant number, since it is smaller than the sum of its proper divisors (1490174443584).

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

639397319616 is a wasteful number, since it uses less digits than its factorization.

639397319616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11385 (or 11369 counting only the distinct ones).

The product of its digits is 29760696, while the sum is 63.

The spelling of 639397319616 in words is "six hundred thirty-nine billion, three hundred ninety-seven million, three hundred nineteen thousand, six hundred sixteen".