13663214065981 has 2 divisors, whose sum is σ = 13663214065982. Its totient is φ = 13663214065980.

The previous prime is 13663214065927. The next prime is 13663214066053. The reversal of 13663214065981 is 18956041236631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11238357797956 + 2424856268025 = 3352366^2 + 1557195^2 .

It is a cyclic number.

It is not a de Polignac number, because 13663214065981 - 2²¹ = 13663211968829 is a prime.

It is a super-2 number, since 2×13663214065981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13663214065381) 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, 6831607032990 + 6831607032991.

It is an arithmetic number, because the mean of its divisors is an integer number (6831607032991).

Almost surely, 2^{13663214065981} is an apocalyptic number.

It is an amenable number.

13663214065981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13663214065981 is an equidigital number, since it uses as much as digits as its factorization.

13663214065981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 13663214065981 in words is "thirteen trillion, six hundred sixty-three billion, two hundred fourteen million, sixty-five thousand, nine hundred eighty-one".