6665205540 has 192 divisors, whose sum is σ = 21956014080. Its totient is φ = 1479098880.

The previous prime is 6665205539. The next prime is 6665205559. The reversal of 6665205540 is 455025666.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3267841 + ... + 3269879.

It is an arithmetic number, because the mean of its divisors is an integer number (114354240).

Almost surely, 2^6665205540 is an apocalyptic number.

6665205540 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 6665205540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10978007040).

6665205540 is an abundant number, since it is smaller than the sum of its proper divisors (15290808540).

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

6665205540 is a wasteful number, since it uses less digits than its factorization.

6665205540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2282 (or 2280 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 39.

The square root of 6665205540 is about 81640.7100655059. The cubic root of 6665205540 is about 1881.9345504322.

The spelling of 6665205540 in words is "six billion, six hundred sixty-five million, two hundred five thousand, five hundred forty".