666323666 has 4 divisors (see below), whose sum is σ = 999485502. Its totient is φ = 333161832.

The previous prime is 666323663. The next prime is 666323701.

666323666 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 601279441 + 65044225 = 24521^2 + 8065^2 .

It is not an unprimeable number, because it can be changed into a prime (666323663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166580915 + ... + 166580918.

Almost surely, 2^666323666 is an apocalyptic number.

666323666 is a deficient number, since it is larger than the sum of its proper divisors (333161836).

666323666 is a wasteful number, since it uses less digits than its factorization.

666323666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333161835.

The product of its digits is 839808, while the sum is 44.

The square root of 666323666 is about 25813.2459407956. The cubic root of 666323666 is about 873.4306196940.

The spelling of 666323666 in words is "six hundred sixty-six million, three hundred twenty-three thousand, six hundred sixty-six".