13634556163661 has 2 divisors, whose sum is σ = 13634556163662. Its totient is φ = 13634556163660.

The previous prime is 13634556163637. The next prime is 13634556163759. The reversal of 13634556163661 is 16636165543631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13153634718436 + 480921445225 = 3626794^2 + 693485^2 .

It is an emirp because it is prime and its reverse (16636165543631) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13634556163661 is a prime.

It is a super-2 number, since 2×13634556163661² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13634556163597 and 13634556163606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13634556163561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6817278081830 + 6817278081831.

It is an arithmetic number, because the mean of its divisors is an integer number (6817278081831).

Almost surely, 2^{13634556163661} is an apocalyptic number.

It is an amenable number.

13634556163661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13634556163661 is an equidigital number, since it uses as much as digits as its factorization.

13634556163661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20995200, while the sum is 56.

The spelling of 13634556163661 in words is "thirteen trillion, six hundred thirty-four billion, five hundred fifty-six million, one hundred sixty-three thousand, six hundred sixty-one".