2166365305 has 8 divisors (see below), whose sum is σ = 2799610632. Its totient is φ = 1599777408.

The previous prime is 2166365303. The next prime is 2166365317. The reversal of 2166365305 is 5035636612.

It can be written as a sum of positive squares in 4 ways, for example, as 11641744 + 2154723561 = 3412^2 + 46419^2 .

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 2166365305 - 2¹ = 2166365303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166365303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16664284 + ... + 16664413.

It is an arithmetic number, because the mean of its divisors is an integer number (349951329).

Almost surely, 2^2166365305 is an apocalyptic number.

It is an amenable number.

2166365305 is a deficient number, since it is larger than the sum of its proper divisors (633245327).

2166365305 is a wasteful number, since it uses less digits than its factorization.

2166365305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33328715.

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 2166365305 is about 46544.2295564123. The cubic root of 2166365305 is about 1293.9293496683.

It can be divided in two parts, 21663 and 65305, that added together give a palindrome (86968).

The spelling of 2166365305 in words is "two billion, one hundred sixty-six million, three hundred sixty-five thousand, three hundred five".