6691556074913 has 8 divisors (see below), whose sum is σ = 6719603524200. Its totient is φ = 6663544064128.

The previous prime is 6691556074909. The next prime is 6691556074919. The reversal of 6691556074913 is 3194706551966.

It can be written as a sum of positive squares in 4 ways, for example, as 3247755435409 + 3443800639504 = 1802153^2 + 1855748^2 .

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 6691556074913 - 2² = 6691556074909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6691556074919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8481158 + ... + 9236511.

It is an arithmetic number, because the mean of its divisors is an integer number (839950440525).

Almost surely, 2^{6691556074913} is an apocalyptic number.

It is an amenable number.

6691556074913 is a deficient number, since it is larger than the sum of its proper divisors (28047449287).

6691556074913 is a wasteful number, since it uses less digits than its factorization.

6691556074913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17719251.

The product of its (nonzero) digits is 36741600, while the sum is 62.

The spelling of 6691556074913 in words is "six trillion, six hundred ninety-one billion, five hundred fifty-six million, seventy-four thousand, nine hundred thirteen".