6665804839684 has 27 divisors (see below), whose sum is σ = 11713056689397. Its totient is φ = 3319272981504.

The previous prime is 6665804839679. The next prime is 6665804839699. The reversal of 6665804839684 is 4869384085666.

The square root of 6665804839684 is 2581822.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6562460592900 + 103344246784 = 2561730^2 + 321472^2 .

It is a Duffinian number.

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 8 ways as a sum of consecutive naturals, for example, 1327053997 + ... + 1327059019.

Almost surely, 2^{6665804839684} is an apocalyptic number.

6665804839684 is the 2581822-nd square number.

It is an amenable number.

6665804839684 is a deficient number, since it is larger than the sum of its proper divisors (5047251849713).

6665804839684 is an frugal number, since it uses more digits than its factorization.

6665804839684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10564 (or 5282 counting only the distinct ones).

The product of its (nonzero) digits is 1433272320, while the sum is 73.

The spelling of 6665804839684 in words is "six trillion, six hundred sixty-five billion, eight hundred four million, eight hundred thirty-nine thousand, six hundred eighty-four".