6818781394 has 8 divisors (see below), whose sum is σ = 10401531120. Its totient is φ = 3351604356.

The previous prime is 6818781353. The next prime is 6818781407. The reversal of 6818781394 is 4931878186.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28893024 + ... + 28893259.

It is an arithmetic number, because the mean of its divisors is an integer number (1300191390).

Almost surely, 2^6818781394 is an apocalyptic number.

6818781394 is a deficient number, since it is larger than the sum of its proper divisors (3582749726).

6818781394 is a wasteful number, since it uses less digits than its factorization.

6818781394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57786344.

The product of its digits is 2322432, while the sum is 55.

The square root of 6818781394 is about 82575.9129165400. The cubic root of 6818781394 is about 1896.2790884557.

The spelling of 6818781394 in words is "six billion, eight hundred eighteen million, seven hundred eighty-one thousand, three hundred ninety-four".