666939180960 has 144 divisors (see below), whose sum is σ = 2451001558824. Its totient is φ = 164169639936.

The previous prime is 666939180883. The next prime is 666939180979. The reversal of 666939180960 is 69081939666.

It can be written as a sum of positive squares in 4 ways, for example, as 402377086224 + 264562094736 = 634332^2 + 514356^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 17794827 + ... + 17832266.

Almost surely, 2^666939180960 is an apocalyptic number.

666939180960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666939180960 is an abundant number, since it is smaller than the sum of its proper divisors (1784062377864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666939180960 is a wasteful number, since it uses less digits than its factorization.

666939180960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35627127 (or 35627116 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 63.

The spelling of 666939180960 in words is "six hundred sixty-six billion, nine hundred thirty-nine million, one hundred eighty thousand, nine hundred sixty".