6620816305 has 4 divisors (see below), whose sum is σ = 7944979572. Its totient is φ = 5296653040.

The previous prime is 6620816287. The next prime is 6620816309. The reversal of 6620816305 is 5036180266.

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 1500555169 + 5120261136 = 38737^2 + 71556^2 .

It is not a de Polignac number, because 6620816305 - 2⁵ = 6620816273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6620816309) 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, 662081626 + ... + 662081635.

It is an arithmetic number, because the mean of its divisors is an integer number (1986244893).

Almost surely, 2^6620816305 is an apocalyptic number.

It is an amenable number.

6620816305 is a deficient number, since it is larger than the sum of its proper divisors (1324163267).

6620816305 is a wasteful number, since it uses less digits than its factorization.

6620816305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324163266.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 6620816305 is about 81368.3986876969. The cubic root of 6620816305 is about 1877.7474440757.

The spelling of 6620816305 in words is "six billion, six hundred twenty million, eight hundred sixteen thousand, three hundred five".