66116805 has 16 divisors (see below), whose sum is σ = 108368064. Its totient is φ = 34401920.

The previous prime is 66116797. The next prime is 66116819. The reversal of 66116805 is 50861166.

It is not a de Polignac number, because 66116805 - 2³ = 66116797 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53139 + ... + 54368.

It is an arithmetic number, because the mean of its divisors is an integer number (6773004).

Almost surely, 2^66116805 is an apocalyptic number.

It is an amenable number.

66116805 is a deficient number, since it is larger than the sum of its proper divisors (42251259).

66116805 is a wasteful number, since it uses less digits than its factorization.

66116805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107556.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 66116805 is about 8131.2240775913. The cubic root of 66116805 is about 404.3622641067.

The spelling of 66116805 in words is "sixty-six million, one hundred sixteen thousand, eight hundred five".