6660566605 has 48 divisors (see below), whose sum is σ = 10099539072. Its totient is φ = 4127587200.

The previous prime is 6660566569. The next prime is 6660566609. The reversal of 6660566605 is 5066650666.

It is not a de Polignac number, because 6660566605 - 2²¹ = 6658469453 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660566609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 728110 + ... + 737200.

It is an arithmetic number, because the mean of its divisors is an integer number (210407064).

Almost surely, 2^6660566605 is an apocalyptic number.

It is an amenable number.

6660566605 is a deficient number, since it is larger than the sum of its proper divisors (3438972467).

6660566605 is a wasteful number, since it uses less digits than its factorization.

6660566605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9298 (or 9287 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 46.

The square root of 6660566605 is about 81612.2944475892. The cubic root of 6660566605 is about 1881.4978448090.

The spelling of 6660566605 in words is "six billion, six hundred sixty million, five hundred sixty-six thousand, six hundred five".