666823706 has 8 divisors (see below), whose sum is σ = 1000345140. Its totient is φ = 333375328.

The previous prime is 666823699. The next prime is 666823711. The reversal of 666823706 is 607328666.

It can be written as a sum of positive squares in 2 ways, for example, as 615486481 + 51337225 = 24809^2 + 7165^2 .

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, 26510 + ... + 45126.

Almost surely, 2^666823706 is an apocalyptic number.

666823706 is a deficient number, since it is larger than the sum of its proper divisors (333521434).

666823706 is a wasteful number, since it uses less digits than its factorization.

666823706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36528.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 666823706 is about 25822.9298492638. The cubic root of 666823706 is about 873.6490525980.

The spelling of 666823706 in words is "six hundred sixty-six million, eight hundred twenty-three thousand, seven hundred six".