7821116318 has 16 divisors (see below), whose sum is σ = 12096158976. Its totient is φ = 3790452120.

The previous prime is 7821116309. The next prime is 7821116363. The reversal of 7821116318 is 8136111287.

It is a happy number.

It is a super-2 number, since 2×7821116318² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 335846 + ... + 358377.

It is an arithmetic number, because the mean of its divisors is an integer number (756009936).

Almost surely, 2^7821116318 is an apocalyptic number.

7821116318 is a deficient number, since it is larger than the sum of its proper divisors (4275042658).

7821116318 is a wasteful number, since it uses less digits than its factorization.

7821116318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694399.

The product of its digits is 16128, while the sum is 38.

The square root of 7821116318 is about 88437.0754717726. The cubic root of 7821116318 is about 1984.9805164036.

The spelling of 7821116318 in words is "seven billion, eight hundred twenty-one million, one hundred sixteen thousand, three hundred eighteen".