6643243346 has 4 divisors (see below), whose sum is σ = 9964865022. Its totient is φ = 3321621672.

The previous prime is 6643243291. The next prime is 6643243349. The reversal of 6643243346 is 6433423466.

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

It can be written as a sum of positive squares in only one way, i.e., 5853015025 + 790228321 = 76505^2 + 28111^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6643243349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660810835 + ... + 1660810838.

Almost surely, 2^6643243346 is an apocalyptic number.

6643243346 is a deficient number, since it is larger than the sum of its proper divisors (3321621676).

6643243346 is a wasteful number, since it uses less digits than its factorization.

6643243346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321621675.

The product of its digits is 746496, while the sum is 41.

The square root of 6643243346 is about 81506.0939194119. The cubic root of 6643243346 is about 1879.8652523387.

The spelling of 6643243346 in words is "six billion, six hundred forty-three million, two hundred forty-three thousand, three hundred forty-six".