13787240198581 has 2 divisors, whose sum is σ = 13787240198582. Its totient is φ = 13787240198580.

The previous prime is 13787240198561. The next prime is 13787240198587. The reversal of 13787240198581 is 18589104278731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13713912432900 + 73327765681 = 3703230^2 + 270791^2 .

It is a cyclic number.

It is not a de Polignac number, because 13787240198581 - 2⁵ = 13787240198549 is a prime.

It is a super-2 number, since 2×13787240198581² (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 (13787240198587) 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, 6893620099290 + 6893620099291.

It is an arithmetic number, because the mean of its divisors is an integer number (6893620099291).

Almost surely, 2^{13787240198581} is an apocalyptic number.

It is an amenable number.

13787240198581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13787240198581 is an equidigital number, since it uses as much as digits as its factorization.

13787240198581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27095040, while the sum is 64.

The spelling of 13787240198581 in words is "thirteen trillion, seven hundred eighty-seven billion, two hundred forty million, one hundred ninety-eight thousand, five hundred eighty-one".