6721066368 has 320 divisors, whose sum is σ = 20827865520. Its totient is φ = 2149908480.

The previous prime is 6721066351. The next prime is 6721066421. The reversal of 6721066368 is 8636601276.

6721066368 is a `hidden beast` number, since 6 + 7 + 2 + 1 + 0 + 6 + 636 + 8 = 666.

It is a super-2 number, since 2×6721066368² = 90345466246121422848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 41233455 + ... + 41233617.

Almost surely, 2^6721066368 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 6721066368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10413932760).

6721066368 is an abundant number, since it is smaller than the sum of its proper divisors (14106799152).

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

6721066368 is a wasteful number, since it uses less digits than its factorization.

6721066368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 6721066368 is about 81982.1100484734. The cubic root of 6721066368 is about 1887.1774042658.

The spelling of 6721066368 in words is "six billion, seven hundred twenty-one million, sixty-six thousand, three hundred sixty-eight".