2166716305 has 8 divisors (see below), whose sum is σ = 2800064232. Its totient is φ = 1600036608.

The previous prime is 2166716297. The next prime is 2166716323. The reversal of 2166716305 is 5036176612.

It is a Cunningham number, because it is equal to 46548²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 320553216 + 1846163089 = 17904^2 + 42967^2 .

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 2166716305 - 2³ = 2166716297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16666984 + ... + 16667113.

It is an arithmetic number, because the mean of its divisors is an integer number (350008029).

Almost surely, 2^2166716305 is an apocalyptic number.

It is an amenable number.

2166716305 is a deficient number, since it is larger than the sum of its proper divisors (633347927).

2166716305 is a wasteful number, since it uses less digits than its factorization.

2166716305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33334115.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 2166716305 is about 46548.0000107416. Note that the first 4 decimals coincide. The cubic root of 2166716305 is about 1293.9992277992. Note that the first 3 decimals are identical.

The spelling of 2166716305 in words is "two billion, one hundred sixty-six million, seven hundred sixteen thousand, three hundred five".