6660575665 has 16 divisors (see below), whose sum is σ = 8321873616. Its totient is φ = 5113267200.

The previous prime is 6660575651. The next prime is 6660575689. The reversal of 6660575665 is 5665750666.

6660575665 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 4281477489 + 2379098176 = 65433^2 + 48776^2 .

It is not a de Polignac number, because 6660575665 - 2¹¹ = 6660573617 is a prime.

It is a Duffinian number.

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, 253812 + ... + 278821.

It is an arithmetic number, because the mean of its divisors is an integer number (520117101).

Almost surely, 2^6660575665 is an apocalyptic number.

It is an amenable number.

6660575665 is a deficient number, since it is larger than the sum of its proper divisors (1661297951).

6660575665 is a wasteful number, since it uses less digits than its factorization.

6660575665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532740.

The product of its (nonzero) digits is 6804000, while the sum is 52.

The square root of 6660575665 is about 81612.3499539132. The cubic root of 6660575665 is about 1881.4986979078.

The spelling of 6660575665 in words is "six billion, six hundred sixty million, five hundred seventy-five thousand, six hundred sixty-five".