13656617677 has 2 divisors, whose sum is σ = 13656617678. Its totient is φ = 13656617676.

The previous prime is 13656617657. The next prime is 13656617693. The reversal of 13656617677 is 77671665631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13600457641 + 56160036 = 116621^2 + 7494^2 .

It is a cyclic number.

It is not a de Polignac number, because 13656617677 - 2¹⁹ = 13656093389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13656617627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6828308838 + 6828308839.

It is an arithmetic number, because the mean of its divisors is an integer number (6828308839).

Almost surely, 2^13656617677 is an apocalyptic number.

It is an amenable number.

13656617677 is a deficient number, since it is larger than the sum of its proper divisors (1).

13656617677 is an equidigital number, since it uses as much as digits as its factorization.

13656617677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6667920, while the sum is 55.

The spelling of 13656617677 in words is "thirteen billion, six hundred fifty-six million, six hundred seventeen thousand, six hundred seventy-seven".