6678240643 has 4 divisors (see below), whose sum is σ = 6723061200. Its totient is φ = 6633420088.

The previous prime is 6678240599. The next prime is 6678240649. The reversal of 6678240643 is 3460428766.

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

It is a cyclic number.

It is not a de Polignac number, because 6678240643 - 2²⁵ = 6644686211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6678240593 and 6678240602.

It is not an unprimeable number, because it can be changed into a prime (6678240649) 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, 22410055 + ... + 22410352.

It is an arithmetic number, because the mean of its divisors is an integer number (1680765300).

Almost surely, 2^6678240643 is an apocalyptic number.

6678240643 is a deficient number, since it is larger than the sum of its proper divisors (44820557).

6678240643 is a wasteful number, since it uses less digits than its factorization.

6678240643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44820556.

The product of its (nonzero) digits is 1161216, while the sum is 46.

The square root of 6678240643 is about 81720.5031984018. The cubic root of 6678240643 is about 1883.1605809505.

The spelling of 6678240643 in words is "six billion, six hundred seventy-eight million, two hundred forty thousand, six hundred forty-three".