666733988 has 24 divisors (see below), whose sum is σ = 1205992704. Its totient is φ = 322192800.

The previous prime is 666733987. The next prime is 666734017. The reversal of 666733988 is 889337666.

It is not an unprimeable number, because it can be changed into a prime (666733981) 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 in 7 ways as a sum of consecutive naturals, for example, 105683 + ... + 111813.

It is an arithmetic number, because the mean of its divisors is an integer number (50249696).

Almost surely, 2^666733988 is an apocalyptic number.

It is an amenable number.

666733988 is a deficient number, since it is larger than the sum of its proper divisors (539258716).

666733988 is a wasteful number, since it uses less digits than its factorization.

666733988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7043 (or 7041 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 56.

The square root of 666733988 is about 25821.1926138201. The cubic root of 666733988 is about 873.6098690474.

The spelling of 666733988 in words is "six hundred sixty-six million, seven hundred thirty-three thousand, nine hundred eighty-eight".