6601021604 has 12 divisors (see below), whose sum is σ = 11588231004. Its totient is φ = 3290098464.

The previous prime is 6601021601. The next prime is 6601021619. The reversal of 6601021604 is 4061201066.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3340840000 + 3260181604 = 57800^2 + 57098^2 .

It is not an unprimeable number, because it can be changed into a prime (6601021601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2601659 + ... + 2604194.

It is an arithmetic number, because the mean of its divisors is an integer number (965685917).

Almost surely, 2^6601021604 is an apocalyptic number.

It is an amenable number.

6601021604 is a deficient number, since it is larger than the sum of its proper divisors (4987209400).

6601021604 is a wasteful number, since it uses less digits than its factorization.

6601021604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5206174 (or 5206172 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 6601021604 is about 81246.6713410463. The cubic root of 6601021604 is about 1875.8742332904.

The spelling of 6601021604 in words is "six billion, six hundred one million, twenty-one thousand, six hundred four".