6691556074912 has 48 divisors (see below), whose sum is σ = 13666884605640. Its totient is φ = 3221254930432.

The previous prime is 6691556074909. The next prime is 6691556074919. The reversal of 6691556074912 is 2194706551966.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5815602341136 + 875953733776 = 2411556^2 + 935924^2 .

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

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9885913 + ... + 10541080.

Almost surely, 2^{6691556074912} is an apocalyptic number.

It is an amenable number.

6691556074912 is an abundant number, since it is smaller than the sum of its proper divisors (6975328530728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6691556074912 is a wasteful number, since it uses less digits than its factorization.

6691556074912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20427385 (or 20427377 counting only the distinct ones).

The product of its (nonzero) digits is 24494400, while the sum is 61.

The spelling of 6691556074912 in words is "six trillion, six hundred ninety-one billion, five hundred fifty-six million, seventy-four thousand, nine hundred twelve".