6649021209605 has 8 divisors (see below), whose sum is σ = 7988688034200. Its totient is φ = 5312641912576.

The previous prime is 6649021209599. The next prime is 6649021209613. The reversal of 6649021209605 is 5069021209466.

It is a happy number.

6649021209605 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3578006799844 + 3071014409761 = 1891562^2 + 1752431^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6649021209605 - 2¹⁶ = 6649021144069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 821877440 + ... + 821885529.

It is an arithmetic number, because the mean of its divisors is an integer number (998586004275).

Almost surely, 2^{6649021209605} is an apocalyptic number.

It is an amenable number.

6649021209605 is a deficient number, since it is larger than the sum of its proper divisors (1339666824595).

6649021209605 is a wasteful number, since it uses less digits than its factorization.

6649021209605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643763783.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 6649021209605 in words is "six trillion, six hundred forty-nine billion, twenty-one million, two hundred nine thousand, six hundred five".