13138661387 has 2 divisors, whose sum is σ = 13138661388. Its totient is φ = 13138661386.

The previous prime is 13138661339. The next prime is 13138661407. The reversal of 13138661387 is 78316683131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13138661387 is a prime.

It is not a weakly prime, because it can be changed into another prime (13138661687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6569330693 + 6569330694.

It is an arithmetic number, because the mean of its divisors is an integer number (6569330694).

Almost surely, 2^13138661387 is an apocalyptic number.

13138661387 is a deficient number, since it is larger than the sum of its proper divisors (1).

13138661387 is an equidigital number, since it uses as much as digits as its factorization.

13138661387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 47.

The spelling of 13138661387 in words is "thirteen billion, one hundred thirty-eight million, six hundred sixty-one thousand, three hundred eighty-seven".