6681739028836 has 81 divisors (see below), whose sum is σ = 12106931674201. Its totient is φ = 3226624423936.

The previous prime is 6681739028807. The next prime is 6681739028837. The reversal of 6681739028836 is 6388209371866.

The square root of 6681739028836 is 2584906.

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., 6578147744100 + 103591284736 = 2564790^2 + 321856^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6681739028837) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 25998984420 + ... + 25998984676.

Almost surely, 2^{6681739028836} is an apocalyptic number.

6681739028836 is the 2584906-th square number.

It is an amenable number.

6681739028836 is a deficient number, since it is larger than the sum of its proper divisors (5425192645365).

6681739028836 is an equidigital number, since it uses as much as digits as its factorization.

6681739028836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 67.

The spelling of 6681739028836 in words is "six trillion, six hundred eighty-one billion, seven hundred thirty-nine million, twenty-eight thousand, eight hundred thirty-six".