6616555660 has 96 divisors (see below), whose sum is σ = 16671578112. Its totient is φ = 2173643520.

The previous prime is 6616555633. The next prime is 6616555661. The reversal of 6616555660 is 665556166.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 6616555660.

It is not an unprimeable number, because it can be changed into a prime (6616555661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109809 + ... + 159031.

It is an arithmetic number, because the mean of its divisors is an integer number (173662272).

Almost surely, 2^6616555660 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 6616555660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8335789056).

6616555660 is an abundant number, since it is smaller than the sum of its proper divisors (10055022452).

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

6616555660 is a wasteful number, since it uses less digits than its factorization.

6616555660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49303 (or 49301 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 46.

The square root of 6616555660 is about 81342.2132720766. The cubic root of 6616555660 is about 1877.3445666633.

The spelling of 6616555660 in words is "six billion, six hundred sixteen million, five hundred fifty-five thousand, six hundred sixty".