6785221013 has 2 divisors, whose sum is σ = 6785221014. Its totient is φ = 6785221012.

The previous prime is 6785220977. The next prime is 6785221021. The reversal of 6785221013 is 3101225876.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6782840164 + 2380849 = 82358^2 + 1543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6785221013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6785221213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3392610506 + 3392610507.

It is an arithmetic number, because the mean of its divisors is an integer number (3392610507).

Almost surely, 2^6785221013 is an apocalyptic number.

It is an amenable number.

6785221013 is a deficient number, since it is larger than the sum of its proper divisors (1).

6785221013 is an equidigital number, since it uses as much as digits as its factorization.

6785221013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 6785221013 is about 82372.4529985601. The cubic root of 6785221013 is about 1893.1629626634.

Adding to 6785221013 its reverse (3101225876), we get a palindrome (9886446889).

The spelling of 6785221013 in words is "six billion, seven hundred eighty-five million, two hundred twenty-one thousand, thirteen".