13203985787497 has 2 divisors, whose sum is σ = 13203985787498. Its totient is φ = 13203985787496.

The previous prime is 13203985787471. The next prime is 13203985787521. The reversal of 13203985787497 is 79478758930231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13176689460841 + 27296326656 = 3629971^2 + 165216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13203985787497 is a prime.

It is not a weakly prime, because it can be changed into another prime (13203985782497) 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, 6601992893748 + 6601992893749.

It is an arithmetic number, because the mean of its divisors is an integer number (6601992893749).

Almost surely, 2^{13203985787497} is an apocalyptic number.

It is an amenable number.

13203985787497 is a deficient number, since it is larger than the sum of its proper divisors (1).

13203985787497 is an equidigital number, since it uses as much as digits as its factorization.

13203985787497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640120320, while the sum is 73.

The spelling of 13203985787497 in words is "thirteen trillion, two hundred three billion, nine hundred eighty-five million, seven hundred eighty-seven thousand, four hundred ninety-seven".