7968665689 has 4 divisors (see below), whose sum is σ = 7973363124. Its totient is φ = 7963968256.

The previous prime is 7968665681. The next prime is 7968665737. The reversal of 7968665689 is 9865668697.

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 3768977664 + 4199688025 = 61392^2 + 64805^2 .

It is a cyclic number.

It is not a de Polignac number, because 7968665689 - 2³ = 7968665681 is a prime.

It is a super-3 number, since 3×7968665689³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7968665681) 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, 2346172 + ... + 2349565.

It is an arithmetic number, because the mean of its divisors is an integer number (1993340781).

Almost surely, 2^7968665689 is an apocalyptic number.

It is an amenable number.

7968665689 is a deficient number, since it is larger than the sum of its proper divisors (4697435).

7968665689 is a wasteful number, since it uses less digits than its factorization.

7968665689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4697434.

The product of its digits is 235146240, while the sum is 70.

The square root of 7968665689 is about 89267.3831194799. The cubic root of 7968665689 is about 1997.3853908156.

The spelling of 7968665689 in words is "seven billion, nine hundred sixty-eight million, six hundred sixty-five thousand, six hundred eighty-nine".