13636165981 has 2 divisors, whose sum is σ = 13636165982. Its totient is φ = 13636165980.

The previous prime is 13636165967. The next prime is 13636166017. The reversal of 13636165981 is 18956163631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11904773881 + 1731392100 = 109109^2 + 41610^2 .

It is a cyclic number.

It is not a de Polignac number, because 13636165981 - 2¹⁵ = 13636133213 is a prime.

It is a super-2 number, since 2×13636165981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13636165901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6818082990 + 6818082991.

It is an arithmetic number, because the mean of its divisors is an integer number (6818082991).

Almost surely, 2^13636165981 is an apocalyptic number.

It is an amenable number.

13636165981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13636165981 is an equidigital number, since it uses as much as digits as its factorization.

13636165981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 49.

The spelling of 13636165981 in words is "thirteen billion, six hundred thirty-six million, one hundred sixty-five thousand, nine hundred eighty-one".