6605666500 has 48 divisors (see below), whose sum is σ = 14488948656. Its totient is φ = 2630880000.

The previous prime is 6605666477. The next prime is 6605666519. The reversal of 6605666500 is 56665066.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2690911876 + 3914754624 = 51874^2 + 62568^2 .

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, 88150 + ... + 144850.

It is an arithmetic number, because the mean of its divisors is an integer number (301853097).

Almost surely, 2^6605666500 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 6605666500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7244474328).

6605666500 is an abundant number, since it is smaller than the sum of its proper divisors (7883282156).

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

6605666500 is a wasteful number, since it uses less digits than its factorization.

6605666500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56953 (or 56941 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 6605666500 is about 81275.2514606999. The cubic root of 6605666500 is about 1876.3141246848.

It can be divided in two parts, 6 and 605666500, that added together give a palindrome (605666506).

The spelling of 6605666500 in words is "six billion, six hundred five million, six hundred sixty-six thousand, five hundred".