6600665 has 8 divisors (see below), whose sum is σ = 7936008. Its totient is φ = 5270400.

The previous prime is 6600623. The next prime is 6600667. The reversal of 6600665 is 5660066.

It can be written as a sum of positive squares in 4 ways, for example, as 1157776 + 5442889 = 1076^2 + 2333^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-6600665 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6600667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2765 + ... + 4565.

It is an arithmetic number, because the mean of its divisors is an integer number (992001).

Almost surely, 2^6600665 is an apocalyptic number.

It is an amenable number.

6600665 is a deficient number, since it is larger than the sum of its proper divisors (1335343).

6600665 is a wasteful number, since it uses less digits than its factorization.

6600665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2539.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 6600665 is about 2569.1759379225. The cubic root of 6600665 is about 187.5840452847.

The spelling of 6600665 in words is "six million, six hundred thousand, six hundred sixty-five".