6681983213 has 4 divisors (see below), whose sum is σ = 7033666560. Its totient is φ = 6330299868.

The previous prime is 6681983183. The next prime is 6681983221. The reversal of 6681983213 is 3123891866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3123891866 = 2 ⋅1561945933.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6681983213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6681983233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175841645 + ... + 175841682.

It is an arithmetic number, because the mean of its divisors is an integer number (1758416640).

Almost surely, 2^6681983213 is an apocalyptic number.

It is an amenable number.

6681983213 is a deficient number, since it is larger than the sum of its proper divisors (351683347).

6681983213 is a wasteful number, since it uses less digits than its factorization.

6681983213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351683346.

The product of its digits is 373248, while the sum is 47.

The square root of 6681983213 is about 81743.3985897332. The cubic root of 6681983213 is about 1883.5122975433.

The spelling of 6681983213 in words is "six billion, six hundred eighty-one million, nine hundred eighty-three thousand, two hundred thirteen".