666716210 has 8 divisors (see below), whose sum is σ = 1200089196. Its totient is φ = 266686480.

The previous prime is 666716201. The next prime is 666716233. The reversal of 666716210 is 12617666.

666716210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 644804449 + 21911761 = 25393^2 + 4681^2 .

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

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, 33335801 + ... + 33335820.

Almost surely, 2^666716210 is an apocalyptic number.

666716210 is a deficient number, since it is larger than the sum of its proper divisors (533372986).

666716210 is a wasteful number, since it uses less digits than its factorization.

666716210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66671628.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 666716210 is about 25820.8483594169. The cubic root of 666716210 is about 873.6021042443.

The spelling of 666716210 in words is "six hundred sixty-six million, seven hundred sixteen thousand, two hundred ten".