666005306 has 8 divisors (see below), whose sum is σ = 999235764. Its totient is φ = 332926720.

The previous prime is 666005299. The next prime is 666005323. The reversal of 666005306 is 603500666.

It can be written as a sum of positive squares in 2 ways, for example, as 617075281 + 48930025 = 24841^2 + 6995^2 .

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

It is a super-3 number, since 3×666005306³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26285 + ... + 44976.

Almost surely, 2^666005306 is an apocalyptic number.

666005306 is a deficient number, since it is larger than the sum of its proper divisors (333230458).

666005306 is a wasteful number, since it uses less digits than its factorization.

666005306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75936.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 666005306 is about 25807.0786025850. The cubic root of 666005306 is about 873.2914932788.

The spelling of 666005306 in words is "six hundred sixty-six million, five thousand, three hundred six".