6366665 has 4 divisors (see below), whose sum is σ = 7640004. Its totient is φ = 5093328.

The previous prime is 6366649. The next prime is 6366671. The reversal of 6366665 is 5666636.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4338889 + 2027776 = 2083^2 + 1424^2 .

It is a cyclic number.

It is not a de Polignac number, because 6366665 - 2⁴ = 6366649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636662 + ... + 636671.

It is an arithmetic number, because the mean of its divisors is an integer number (1910001).

Almost surely, 2^6366665 is an apocalyptic number.

It is an amenable number.

6366665 is a deficient number, since it is larger than the sum of its proper divisors (1273339).

6366665 is a wasteful number, since it uses less digits than its factorization.

6366665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273338.

The product of its digits is 116640, while the sum is 38.

The square root of 6366665 is about 2523.2251187716. The cubic root of 6366665 is about 185.3406433838.

The spelling of 6366665 in words is "six million, three hundred sixty-six thousand, six hundred sixty-five".