6605638540 has 48 divisors (see below), whose sum is σ = 14139976032. Its totient is φ = 2591525376.

The previous prime is 6605638537. The next prime is 6605638603. The reversal of 6605638540 is 458365066.

It is a super-2 number, since 2×6605638540² = 87268921042266663200, which contains 22 as substring.

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, 301642 + ... + 322798.

It is an arithmetic number, because the mean of its divisors is an integer number (294582834).

Almost surely, 2^6605638540 is an apocalyptic number.

It is an amenable number.

6605638540 is an abundant number, since it is smaller than the sum of its proper divisors (7534337492).

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

6605638540 is a wasteful number, since it uses less digits than its factorization.

6605638540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21466 (or 21464 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The square root of 6605638540 is about 81275.0794524373. The cubic root of 6605638540 is about 1876.3114773710.

The spelling of 6605638540 in words is "six billion, six hundred five million, six hundred thirty-eight thousand, five hundred forty".