1604804666 has 8 divisors (see below), whose sum is σ = 2432023860. Its totient is φ = 794130048.

The previous prime is 1604804647. The next prime is 1604804671. The reversal of 1604804666 is 6664084061.

It can be written as a sum of positive squares in 2 ways, for example, as 1468499041 + 136305625 = 38321^2 + 11675^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 4135901 + ... + 4136288.

Almost surely, 2^1604804666 is an apocalyptic number.

1604804666 is a deficient number, since it is larger than the sum of its proper divisors (827219194).

1604804666 is an equidigital number, since it uses as much as digits as its factorization.

1604804666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8272288.

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 1604804666 is about 40060.0133050402. The cubic root of 1604804666 is about 1170.7766694050.

The spelling of 1604804666 in words is "one billion, six hundred four million, eight hundred four thousand, six hundred sixty-six".