2001604066 has 32 divisors (see below), whose sum is σ = 3763992960. Its totient is φ = 775526400.

The previous prime is 2001604057. The next prime is 2001604067. The reversal of 2001604066 is 6604061002.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001604066.

It is not an unprimeable number, because it can be changed into a prime (2001604067) 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 15 ways as a sum of consecutive naturals, for example, 8031 + ... + 63778.

It is an arithmetic number, because the mean of its divisors is an integer number (117624780).

Almost surely, 2^2001604066 is an apocalyptic number.

2001604066 is a deficient number, since it is larger than the sum of its proper divisors (1762388894).

2001604066 is a wasteful number, since it uses less digits than its factorization.

2001604066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72010.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 2001604066 is about 44739.2899586035. The cubic root of 2001604066 is about 1260.2577926378.

Adding to 2001604066 its reverse (6604061002), we get a palindrome (8605665068).

The spelling of 2001604066 in words is "two billion, one million, six hundred four thousand, sixty-six".