2808638916605 has 8 divisors (see below), whose sum is σ = 3403736667864. Its totient is φ = 2224664488000.

The previous prime is 2808638916583. The next prime is 2808638916619. The reversal of 2808638916605 is 5066198368082.

It can be written as a sum of positive squares in 4 ways, for example, as 1119317448484 + 1689321468121 = 1057978^2 + 1299739^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2808638916605 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2780830106 + ... + 2780831115.

It is an arithmetic number, because the mean of its divisors is an integer number (425467083483).

Almost surely, 2^{2808638916605} is an apocalyptic number.

It is an amenable number.

2808638916605 is a deficient number, since it is larger than the sum of its proper divisors (595097751259).

2808638916605 is a wasteful number, since it uses less digits than its factorization.

2808638916605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561661327.

The product of its (nonzero) digits is 29859840, while the sum is 62.

The spelling of 2808638916605 in words is "two trillion, eight hundred eight billion, six hundred thirty-eight million, nine hundred sixteen thousand, six hundred five".