666105320 has 16 divisors (see below), whose sum is σ = 1498737060. Its totient is φ = 266442112.

The previous prime is 666105301. The next prime is 666105329. The reversal of 666105320 is 23501666.

It can be written as a sum of positive squares in 2 ways, for example, as 665536804 + 568516 = 25798^2 + 754^2 .

It is not an unprimeable number, because it can be changed into a prime (666105329) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8326277 + ... + 8326356.

Almost surely, 2^666105320 is an apocalyptic number.

It is an amenable number.

666105320 is an abundant number, since it is smaller than the sum of its proper divisors (832631740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666105320 is a wasteful number, since it uses less digits than its factorization.

666105320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16652644 (or 16652640 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 666105320 is about 25809.0162540148. The cubic root of 666105320 is about 873.3352051446.

Adding to 666105320 its reverse (23501666), we get a palindrome (689606986).

The spelling of 666105320 in words is "six hundred sixty-six million, one hundred five thousand, three hundred twenty".