7868312918 has 4 divisors (see below), whose sum is σ = 11802469380. Its totient is φ = 3934156458.

The previous prime is 7868312909. The next prime is 7868312923. The reversal of 7868312918 is 8192138687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8192138687 = 17 ⋅481890511.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7868312918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1967078228 + ... + 1967078231.

It is an arithmetic number, because the mean of its divisors is an integer number (2950617345).

Almost surely, 2^7868312918 is an apocalyptic number.

7868312918 is a deficient number, since it is larger than the sum of its proper divisors (3934156462).

7868312918 is a wasteful number, since it uses less digits than its factorization.

7868312918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934156461.

The product of its digits is 1161216, while the sum is 53.

The square root of 7868312918 is about 88703.5113059229. The cubic root of 7868312918 is about 1988.9653062362.

The spelling of 7868312918 in words is "seven billion, eight hundred sixty-eight million, three hundred twelve thousand, nine hundred eighteen".