6678261809 has 4 divisors (see below), whose sum is σ = 6680932416. Its totient is φ = 6675591204.

The previous prime is 6678261803. The next prime is 6678261829. The reversal of 6678261809 is 9081628766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6678261809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6678261803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1331549 + ... + 1336554.

It is an arithmetic number, because the mean of its divisors is an integer number (1670233104).

Almost surely, 2^6678261809 is an apocalyptic number.

It is an amenable number.

6678261809 is a deficient number, since it is larger than the sum of its proper divisors (2670607).

6678261809 is a wasteful number, since it uses less digits than its factorization.

6678261809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2670606.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 6678261809 is about 81720.6327006834. The cubic root of 6678261809 is about 1883.1625704433.

The spelling of 6678261809 in words is "six billion, six hundred seventy-eight million, two hundred sixty-one thousand, eight hundred nine".