6666601604 has 24 divisors (see below), whose sum is σ = 12705157080. Its totient is φ = 3042319104.

The previous prime is 6666601597. The next prime is 6666601619. The reversal of 6666601604 is 4061066666.

It can be written as a sum of positive squares in 4 ways, for example, as 324072004 + 6342529600 = 18002^2 + 79640^2 .

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 7 ways as a sum of consecutive naturals, for example, 715619 + ... + 724874.

It is an arithmetic number, because the mean of its divisors is an integer number (529381545).

Almost surely, 2^6666601604 is an apocalyptic number.

It is an amenable number.

6666601604 is a deficient number, since it is larger than the sum of its proper divisors (6038555476).

6666601604 is a wasteful number, since it uses less digits than its factorization.

6666601604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440599 (or 1440597 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 41.

The square root of 6666601604 is about 81649.2596659639. The cubic root of 6666601604 is about 1882.0659351108.

The spelling of 6666601604 in words is "six billion, six hundred sixty-six million, six hundred one thousand, six hundred four".