6665599 has 8 divisors (see below), whose sum is σ = 7040880. Its totient is φ = 6292800.

The previous prime is 6665597. The next prime is 6665611. The reversal of 6665599 is 9955666.

It is a happy number.

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

It is not a de Polignac number, because 6665599 - 2¹ = 6665597 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665591) 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, 8379 + ... + 9139.

It is an arithmetic number, because the mean of its divisors is an integer number (880110).

Almost surely, 2^6665599 is an apocalyptic number.

6665599 is a deficient number, since it is larger than the sum of its proper divisors (375281).

6665599 is a wasteful number, since it uses less digits than its factorization.

6665599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241.

The product of its digits is 437400, while the sum is 46.

The square root of 6665599 is about 2581.7821364321. The cubic root of 6665599 is about 188.1971581118.

The spelling of 6665599 in words is "six million, six hundred sixty-five thousand, five hundred ninety-nine".