13663520197 has 4 divisors (see below), whose sum is σ = 13672013740. Its totient is φ = 13655026656.

The previous prime is 13663520191. The next prime is 13663520207. The reversal of 13663520197 is 79102536631.

13663520197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79102536631 = 421 ⋅187892011.

It can be written as a sum of positive squares in 2 ways, for example, as 5927614081 + 7735906116 = 76991^2 + 87954^2 .

It is a cyclic number.

It is not a de Polignac number, because 13663520197 - 2⁷ = 13663520069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13663520191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4244358 + ... + 4247575.

It is an arithmetic number, because the mean of its divisors is an integer number (3418003435).

Almost surely, 2^13663520197 is an apocalyptic number.

It is an amenable number.

13663520197 is a deficient number, since it is larger than the sum of its proper divisors (8493543).

13663520197 is an equidigital number, since it uses as much as digits as its factorization.

13663520197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8493542.

The product of its (nonzero) digits is 204120, while the sum is 43.

The spelling of 13663520197 in words is "thirteen billion, six hundred sixty-three million, five hundred twenty thousand, one hundred ninety-seven".