11563657613 has 4 divisors (see below), whose sum is σ = 11577441120. Its totient is φ = 11549874108.

The previous prime is 11563657579. The next prime is 11563657631. The reversal of 11563657613 is 31675636511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31675636511 = 47 ⋅673949713.

It is a cyclic number.

It is not a de Polignac number, because 11563657613 - 2¹⁰ = 11563656589 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 (11563657513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6890495 + ... + 6892172.

It is an arithmetic number, because the mean of its divisors is an integer number (2894360280).

Almost surely, 2^11563657613 is an apocalyptic number.

It is an amenable number.

11563657613 is a deficient number, since it is larger than the sum of its proper divisors (13783507).

11563657613 is an equidigital number, since it uses as much as digits as its factorization.

11563657613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13783506.

The product of its digits is 340200, while the sum is 44.

The spelling of 11563657613 in words is "eleven billion, five hundred sixty-three million, six hundred fifty-seven thousand, six hundred thirteen".