6664399343 has 4 divisors (see below), whose sum is σ = 7616456400. Its totient is φ = 5712342288.

The previous prime is 6664399327. The next prime is 6664399363. The reversal of 6664399343 is 3439934666.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6664399343 - 2⁴ = 6664399327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664399363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476028518 + ... + 476028531.

It is an arithmetic number, because the mean of its divisors is an integer number (1904114100).

Almost surely, 2^6664399343 is an apocalyptic number.

6664399343 is a deficient number, since it is larger than the sum of its proper divisors (952057057).

6664399343 is an equidigital number, since it uses as much as digits as its factorization.

6664399343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952057056.

The product of its digits is 7558272, while the sum is 53.

The square root of 6664399343 is about 81635.7724468875. The cubic root of 6664399343 is about 1881.8586702434.

The spelling of 6664399343 in words is "six billion, six hundred sixty-four million, three hundred ninety-nine thousand, three hundred forty-three".