6615543660 has 96 divisors (see below), whose sum is σ = 20279960064. Its totient is φ = 1598016000.

The previous prime is 6615543611. The next prime is 6615543667. The reversal of 6615543660 is 663455166.

It is not an unprimeable number, because it can be changed into a prime (6615543667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167625 + ... + 203295.

It is an arithmetic number, because the mean of its divisors is an integer number (211249584).

Almost surely, 2^6615543660 is an apocalyptic number.

6615543660 is a gapful number since it is divisible by the number (60) 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 6615543660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10139980032).

6615543660 is an abundant number, since it is smaller than the sum of its proper divisors (13664416404).

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

6615543660 is a wasteful number, since it uses less digits than its factorization.

6615543660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35975 (or 35973 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 6615543660 is about 81335.9924018881. The cubic root of 6615543660 is about 1877.2488487063.

The spelling of 6615543660 in words is "six billion, six hundred fifteen million, five hundred forty-three thousand, six hundred sixty".