6818102509 has 4 divisors (see below), whose sum is σ = 6822670716. Its totient is φ = 6813534304.

The previous prime is 6818102437. The next prime is 6818102531. The reversal of 6818102509 is 9052018186.

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 5636255625 + 1181846884 = 75075^2 + 34378^2 .

It is a cyclic number.

It is not a de Polignac number, because 6818102509 - 2²⁵ = 6784548077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6818102539) 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, 2281864 + ... + 2284849.

It is an arithmetic number, because the mean of its divisors is an integer number (1705667679).

Almost surely, 2^6818102509 is an apocalyptic number.

It is an amenable number.

6818102509 is a deficient number, since it is larger than the sum of its proper divisors (4568207).

6818102509 is a wasteful number, since it uses less digits than its factorization.

6818102509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4568206.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 6818102509 is about 82571.8021421357. The cubic root of 6818102509 is about 1896.2161545246.

The spelling of 6818102509 in words is "six billion, eight hundred eighteen million, one hundred two thousand, five hundred nine".