13656650561 has 4 divisors (see below), whose sum is σ = 13848997824. Its totient is φ = 13464303300.

The previous prime is 13656650549. The next prime is 13656650587. The reversal of 13656650561 is 16505665631.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13656650561 is a prime.

It is a super-2 number, since 2×13656650561² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13656656561) 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, 96173525 + ... + 96173666.

It is an arithmetic number, because the mean of its divisors is an integer number (3462249456).

Almost surely, 2^13656650561 is an apocalyptic number.

It is an amenable number.

13656650561 is a deficient number, since it is larger than the sum of its proper divisors (192347263).

13656650561 is an equidigital number, since it uses as much as digits as its factorization.

13656650561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192347262.

The product of its (nonzero) digits is 486000, while the sum is 44.

The spelling of 13656650561 in words is "thirteen billion, six hundred fifty-six million, six hundred fifty thousand, five hundred sixty-one".