6816471978 has 8 divisors (see below), whose sum is σ = 13632943968. Its totient is φ = 2272157324.

The previous prime is 6816471967. The next prime is 6816471989. The reversal of 6816471978 is 8791746186.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6816471967) and next prime (6816471989).

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

6816471978 is an admirable number.

It is a super-3 number, since 3×6816471978³ (a number of 30 digits) contains 333 as substring.

It is a Curzon number.

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, 568039326 + ... + 568039337.

It is an arithmetic number, because the mean of its divisors is an integer number (1704117996).

Almost surely, 2^6816471978 is an apocalyptic number.

6816471978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6816471978 is a wasteful number, since it uses less digits than its factorization.

6816471978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136078668.

The product of its digits is 4064256, while the sum is 57.

The square root of 6816471978 is about 82561.9281388220. The cubic root of 6816471978 is about 1896.0649841308.

The spelling of 6816471978 in words is "six billion, eight hundred sixteen million, four hundred seventy-one thousand, nine hundred seventy-eight".