13200561662581 has 2 divisors, whose sum is σ = 13200561662582. Its totient is φ = 13200561662580.

The previous prime is 13200561662539. The next prime is 13200561662597. The reversal of 13200561662581 is 18526616500231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11871925060356 + 1328636602225 = 3445566^2 + 1152665^2 .

It is a cyclic number.

It is not a de Polignac number, because 13200561662581 - 2⁹ = 13200561662069 is a prime.

It is a super-2 number, since 2×13200561662581² (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 (13200561692581) 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, 6600280831290 + 6600280831291.

It is an arithmetic number, because the mean of its divisors is an integer number (6600280831291).

Almost surely, 2^{13200561662581} is an apocalyptic number.

It is an amenable number.

13200561662581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13200561662581 is an equidigital number, since it uses as much as digits as its factorization.

13200561662581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 13200561662581 in words is "thirteen trillion, two hundred billion, five hundred sixty-one million, six hundred sixty-two thousand, five hundred eighty-one".