666983944 has 24 divisors (see below), whose sum is σ = 1374622830. Its totient is φ = 303174080.

The previous prime is 666983939. The next prime is 666983953. The reversal of 666983944 is 449389666.

It can be written as a sum of positive squares in only one way, i.e., 512479044 + 154504900 = 22638^2 + 12430^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 343549 + ... + 345484.

Almost surely, 2^666983944 is an apocalyptic number.

It is an amenable number.

666983944 is an abundant number, since it is smaller than the sum of its proper divisors (707638886).

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

666983944 is a wasteful number, since it uses less digits than its factorization.

666983944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689061 (or 689046 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 55.

The square root of 666983944 is about 25826.0322930178. The cubic root of 666983944 is about 873.7190263975.

The spelling of 666983944 in words is "six hundred sixty-six million, nine hundred eighty-three thousand, nine hundred forty-four".