13656617647 has 2 divisors, whose sum is σ = 13656617648. Its totient is φ = 13656617646.

The previous prime is 13656617641. The next prime is 13656617657. The reversal of 13656617647 is 74671665631.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13656617647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13656617594 and 13656617603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13656617641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6828308823 + 6828308824.

It is an arithmetic number, because the mean of its divisors is an integer number (6828308824).

Almost surely, 2^13656617647 is an apocalyptic number.

13656617647 is a deficient number, since it is larger than the sum of its proper divisors (1).

13656617647 is an equidigital number, since it uses as much as digits as its factorization.

13656617647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 52.

The spelling of 13656617647 in words is "thirteen billion, six hundred fifty-six million, six hundred seventeen thousand, six hundred forty-seven".