666489604 has 36 divisors (see below), whose sum is σ = 1304324784. Its totient is φ = 295528000.

The previous prime is 666489589. The next prime is 666489611. The reversal of 666489604 is 406984666.

666489604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69459 + ... + 78469.

It is an arithmetic number, because the mean of its divisors is an integer number (36231244).

Almost surely, 2^666489604 is an apocalyptic number.

It is an amenable number.

666489604 is a deficient number, since it is larger than the sum of its proper divisors (637835180).

666489604 is a wasteful number, since it uses less digits than its factorization.

666489604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9108 (or 9065 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 49.

The square root of 666489604 is about 25816.4599432223. The cubic root of 666489604 is about 873.5031186450.

The spelling of 666489604 in words is "six hundred sixty-six million, four hundred eighty-nine thousand, six hundred four".