6616556064 has 96 divisors (see below), whose sum is σ = 19317070080. Its totient is φ = 2203372800.

The previous prime is 6616556057. The next prime is 6616556081. The reversal of 6616556064 is 4606556166.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1060474 + ... + 1066694.

It is an arithmetic number, because the mean of its divisors is an integer number (201219480).

Almost surely, 2^6616556064 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 6616556064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9658535040).

6616556064 is an abundant number, since it is smaller than the sum of its proper divisors (12700514016).

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

6616556064 is a wasteful number, since it uses less digits than its factorization.

6616556064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7471 (or 7457 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The square root of 6616556064 is about 81342.2157554120. The cubic root of 6616556064 is about 1877.3446048729.

The spelling of 6616556064 in words is "six billion, six hundred sixteen million, five hundred fifty-six thousand, sixty-four".