666689332 has 12 divisors (see below), whose sum is σ = 1188720036. Its totient is φ = 327055040.

The previous prime is 666689267. The next prime is 666689341. The reversal of 666689332 is 233986666.

It can be written as a sum of positive squares in 2 ways, for example, as 207187236 + 459502096 = 14394^2 + 21436^2 .

It is a congruent number.

It is an unprimeable number.

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, 1572169 + ... + 1572592.

It is an arithmetic number, because the mean of its divisors is an integer number (99060003).

Almost surely, 2^666689332 is an apocalyptic number.

It is an amenable number.

666689332 is a deficient number, since it is larger than the sum of its proper divisors (522030704).

666689332 is a wasteful number, since it uses less digits than its factorization.

666689332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3144818 (or 3144816 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 49.

The square root of 666689332 is about 25820.3278832783. The cubic root of 666689332 is about 873.5903646203.

The spelling of 666689332 in words is "six hundred sixty-six million, six hundred eighty-nine thousand, three hundred thirty-two".