6643246394 has 8 divisors (see below), whose sum is σ = 9965589300. Its totient is φ = 3321383296.

The previous prime is 6643246391. The next prime is 6643246457. The reversal of 6643246394 is 4936423466.

It can be written as a sum of positive squares in 2 ways, for example, as 6640131169 + 3115225 = 81487^2 + 1765^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6643246391) 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, 83069 + ... + 142080.

Almost surely, 2^6643246394 is an apocalyptic number.

6643246394 is a deficient number, since it is larger than the sum of its proper divisors (3322342906).

6643246394 is a wasteful number, since it uses less digits than its factorization.

6643246394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239904.

The product of its digits is 2239488, while the sum is 47.

The square root of 6643246394 is about 81506.1126173982. The cubic root of 6643246394 is about 1879.8655398402.

The spelling of 6643246394 in words is "six billion, six hundred forty-three million, two hundred forty-six thousand, three hundred ninety-four".