13363199981 has 2 divisors, whose sum is σ = 13363199982. Its totient is φ = 13363199980.

The previous prime is 13363199953. The next prime is 13363200017. The reversal of 13363199981 is 18999136331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7236224356 + 6126975625 = 85066^2 + 78275^2 .

It is a cyclic number.

It is not a de Polignac number, because 13363199981 - 2⁶ = 13363199917 is a prime.

It is a super-2 number, since 2×13363199981² (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 (13363199281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6681599990 + 6681599991.

It is an arithmetic number, because the mean of its divisors is an integer number (6681599991).

Almost surely, 2^13363199981 is an apocalyptic number.

It is an amenable number.

13363199981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13363199981 is an equidigital number, since it uses as much as digits as its factorization.

13363199981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 53.

The spelling of 13363199981 in words is "thirteen billion, three hundred sixty-three million, one hundred ninety-nine thousand, nine hundred eighty-one".