6661188996 has 192 divisors, whose sum is σ = 19926466560. Its totient is φ = 1681626240.

The previous prime is 6661188991. The next prime is 6661189027. The reversal of 6661188996 is 6998811666.

It is not an unprimeable number, because it can be changed into a prime (6661188991) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14263555 + ... + 14264021.

It is an arithmetic number, because the mean of its divisors is an integer number (103783680).

Almost surely, 2^6661188996 is an apocalyptic number.

6661188996 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 6661188996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9963233280).

6661188996 is an abundant number, since it is smaller than the sum of its proper divisors (13265277564).

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

6661188996 is a wasteful number, since it uses less digits than its factorization.

6661188996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894 (or 892 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 60.

The square root of 6661188996 is about 81616.1074543500. The cubic root of 6661188996 is about 1881.5564479741.

The spelling of 6661188996 in words is "six billion, six hundred sixty-one million, one hundred eighty-eight thousand, nine hundred ninety-six".