6468641689 has 4 divisors (see below), whose sum is σ = 6482796724. Its totient is φ = 6454486656.

The previous prime is 6468641681. The next prime is 6468641743. The reversal of 6468641689 is 9861468646.

It is a happy number.

6468641689 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 5474816064 + 993825625 = 73992^2 + 31525^2 .

It is a cyclic number.

It is not a de Polignac number, because 6468641689 - 2³ = 6468641681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6468641681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7076832 + ... + 7077745.

It is an arithmetic number, because the mean of its divisors is an integer number (1620699181).

Almost surely, 2^6468641689 is an apocalyptic number.

It is an amenable number.

6468641689 is a deficient number, since it is larger than the sum of its proper divisors (14155035).

6468641689 is a wasteful number, since it uses less digits than its factorization.

6468641689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14155034.

The product of its digits is 11943936, while the sum is 58.

The square root of 6468641689 is about 80427.8663710533. The cubic root of 6468641689 is about 1863.2495790652.

The spelling of 6468641689 in words is "six billion, four hundred sixty-eight million, six hundred forty-one thousand, six hundred eighty-nine".