13663406563 has 4 divisors (see below), whose sum is σ = 13981160248. Its totient is φ = 13345652880.

The previous prime is 13663406543. The next prime is 13663406567. The reversal of 13663406563 is 36560436631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13663406563 - 2²¹ = 13661309411 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 317753641 = 13663406563 / (1 + 3 + 6 + 6 + 3 + 4 + 0 + 6 + 5 + 6 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13663406567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158876778 + ... + 158876863.

It is an arithmetic number, because the mean of its divisors is an integer number (3495290062).

Almost surely, 2^13663406563 is an apocalyptic number.

13663406563 is a deficient number, since it is larger than the sum of its proper divisors (317753685).

13663406563 is an equidigital number, since it uses as much as digits as its factorization.

13663406563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317753684.

The product of its (nonzero) digits is 699840, while the sum is 43.

The spelling of 13663406563 in words is "thirteen billion, six hundred sixty-three million, four hundred six thousand, five hundred sixty-three".