6818080421 has 4 divisors (see below), whose sum is σ = 6863839500. Its totient is φ = 6772321344.

The previous prime is 6818080397. The next prime is 6818080439. The reversal of 6818080421 is 1240808186.

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 1316891521 + 5501188900 = 36289^2 + 74170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6818080421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6818080481) 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, 22879316 + ... + 22879613.

It is an arithmetic number, because the mean of its divisors is an integer number (1715959875).

Almost surely, 2^6818080421 is an apocalyptic number.

It is an amenable number.

6818080421 is a deficient number, since it is larger than the sum of its proper divisors (45759079).

6818080421 is a wasteful number, since it uses less digits than its factorization.

6818080421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45759078.

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 6818080421 is about 82571.6683917674. The cubic root of 6818080421 is about 1896.2141068548.

The spelling of 6818080421 in words is "six billion, eight hundred eighteen million, eighty thousand, four hundred twenty-one".