13663541509 has 2 divisors, whose sum is σ = 13663541510. Its totient is φ = 13663541508.

The previous prime is 13663541501. The next prime is 13663541519. The reversal of 13663541509 is 90514536631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12085704225 + 1577837284 = 109935^2 + 39722^2 .

It is a cyclic number.

It is not a de Polignac number, because 13663541509 - 2³ = 13663541501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13663541501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6831770754 + 6831770755.

It is an arithmetic number, because the mean of its divisors is an integer number (6831770755).

Almost surely, 2^13663541509 is an apocalyptic number.

It is an amenable number.

13663541509 is a deficient number, since it is larger than the sum of its proper divisors (1).

13663541509 is an equidigital number, since it uses as much as digits as its factorization.

13663541509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 43.

The spelling of 13663541509 in words is "thirteen billion, six hundred sixty-three million, five hundred forty-one thousand, five hundred nine".