6664369 has 4 divisors (see below), whose sum is σ = 6725620. Its totient is φ = 6603120.

The previous prime is 6664351. The next prime is 6664381. The reversal of 6664369 is 9634666.

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 5688225 + 976144 = 2385^2 + 988^2 .

It is a cyclic number.

It is not a de Polignac number, because 6664369 - 2⁹ = 6663857 is a prime.

It is a super-2 number, since 2×6664369² = 88827628336322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6664309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30462 + ... + 30679.

It is an arithmetic number, because the mean of its divisors is an integer number (1681405).

Almost surely, 2^6664369 is an apocalyptic number.

It is an amenable number.

6664369 is a deficient number, since it is larger than the sum of its proper divisors (61251).

6664369 is a wasteful number, since it uses less digits than its factorization.

6664369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61250.

The product of its digits is 139968, while the sum is 40.

The square root of 6664369 is about 2581.5439178910. The cubic root of 6664369 is about 188.1855814206.

The spelling of 6664369 in words is "six million, six hundred sixty-four thousand, three hundred sixty-nine".