6616722816 has 384 divisors, whose sum is σ = 21893639040. Its totient is φ = 1972408320.

The previous prime is 6616722787. The next prime is 6616722829. The reversal of 6616722816 is 6182276166.

6616722816 is a `hidden beast` number, since 6 + 616 + 7 + 2 + 28 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

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 47 ways as a sum of consecutive naturals, for example, 28397836 + ... + 28398068.

It is an arithmetic number, because the mean of its divisors is an integer number (57014685).

Almost surely, 2^6616722816 is an apocalyptic number.

6616722816 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 6616722816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10946819520).

6616722816 is an abundant number, since it is smaller than the sum of its proper divisors (15276916224).

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

6616722816 is a wasteful number, since it uses less digits than its factorization.

6616722816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 332 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 6616722816 is about 81343.2407517674. The cubic root of 6616722816 is about 1877.3603758336.

The spelling of 6616722816 in words is "six billion, six hundred sixteen million, seven hundred twenty-two thousand, eight hundred sixteen".