6665585650 has 12 divisors (see below), whose sum is σ = 12397989402. Its totient is φ = 2666234240.

The previous prime is 6665585639. The next prime is 6665585653. The reversal of 6665585650 is 565855666.

It can be written as a sum of positive squares in 3 ways, for example, as 5295327361 + 1370258289 = 72769^2 + 37017^2 .

It is not an unprimeable number, because it can be changed into a prime (6665585653) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 66655807 + ... + 66655906.

Almost surely, 2^6665585650 is an apocalyptic number.

6665585650 is a deficient number, since it is larger than the sum of its proper divisors (5732403752).

6665585650 is a wasteful number, since it uses less digits than its factorization.

6665585650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133311725 (or 133311720 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 52.

The square root of 6665585650 is about 81643.0379763027. The cubic root of 6665585650 is about 1881.9703247000.

The spelling of 6665585650 in words is "six billion, six hundred sixty-five million, five hundred eighty-five thousand, six hundred fifty".