16806891305 has 8 divisors (see below), whose sum is σ = 21354638472. Its totient is φ = 12654600448.

The previous prime is 16806891289. The next prime is 16806891317. The reversal of 16806891305 is 50319860861.

It can be written as a sum of positive squares in 4 ways, for example, as 2131022569 + 14675868736 = 46163^2 + 121144^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16806891305 - 2⁴ = 16806891289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16806891305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98863982 + ... + 98864151.

It is an arithmetic number, because the mean of its divisors is an integer number (2669329809).

Almost surely, 2^16806891305 is an apocalyptic number.

It is an amenable number.

16806891305 is a deficient number, since it is larger than the sum of its proper divisors (4547747167).

16806891305 is a wasteful number, since it uses less digits than its factorization.

16806891305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197728155.

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 16806891305 in words is "sixteen billion, eight hundred six million, eight hundred ninety-one thousand, three hundred five".