6399855767268 has 240 divisors, whose sum is σ = 16916297606208. Its totient is φ = 2109784320000.

The previous prime is 6399855767237. The next prime is 6399855767321. The reversal of 6399855767268 is 8627675589936.

6399855767268 is a `hidden beast` number, since 6 + 39 + 9 + 8 + 5 + 576 + 7 + 2 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

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 79 ways as a sum of consecutive naturals, for example, 11208153423 + ... + 11208153993.

Almost surely, 2^{6399855767268} 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 6399855767268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8458148803104).

6399855767268 is an abundant number, since it is smaller than the sum of its proper divisors (10516441838940).

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

6399855767268 is a wasteful number, since it uses less digits than its factorization.

6399855767268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576 (or 1565 counting only the distinct ones).

The product of its digits is 8230118400, while the sum is 81.

The spelling of 6399855767268 in words is "six trillion, three hundred ninety-nine billion, eight hundred fifty-five million, seven hundred sixty-seven thousand, two hundred sixty-eight".