7988568865 has 4 divisors (see below), whose sum is σ = 9586282644. Its totient is φ = 6390855088.

The previous prime is 7988568851. The next prime is 7988568869. The reversal of 7988568865 is 5688658897.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2289526801 + 5699042064 = 47849^2 + 75492^2 .

It is a cyclic number.

It is not a de Polignac number, because 7988568865 - 2²⁵ = 7955014433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7988568794 and 7988568803.

It is not an unprimeable number, because it can be changed into a prime (7988568869) by changing a digit.

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, 798856882 + ... + 798856891.

It is an arithmetic number, because the mean of its divisors is an integer number (2396570661).

Almost surely, 2^7988568865 is an apocalyptic number.

It is an amenable number.

7988568865 is a deficient number, since it is larger than the sum of its proper divisors (1597713779).

7988568865 is a wasteful number, since it uses less digits than its factorization.

7988568865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597713778.

The product of its digits is 232243200, while the sum is 70.

The square root of 7988568865 is about 89378.7942691106. The cubic root of 7988568865 is about 1999.0469513379.

The spelling of 7988568865 in words is "seven billion, nine hundred eighty-eight million, five hundred sixty-eight thousand, eight hundred sixty-five".