13563303563666 has 16 divisors (see below), whose sum is σ = 21546032077944. Its totient is φ = 6381452673024.

The previous prime is 13563303563611. The next prime is 13563303563707. The reversal of 13563303563666 is 66636530336531.

It can be written as a sum of positive squares in 4 ways, for example, as 10466706682441 + 3096596881225 = 3235229^2 + 1759715^2 .

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, 39778235 + ... + 40117758.

Almost surely, 2^{13563303563666} is an apocalyptic number.

13563303563666 is a deficient number, since it is larger than the sum of its proper divisors (7982728514278).

13563303563666 is a wasteful number, since it uses less digits than its factorization.

13563303563666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79901005.

The product of its (nonzero) digits is 47239200, while the sum is 56.

The spelling of 13563303563666 in words is "thirteen trillion, five hundred sixty-three billion, three hundred three million, five hundred sixty-three thousand, six hundred sixty-six".