201381866717 has 2 divisors, whose sum is σ = 201381866718. Its totient is φ = 201381866716.

The previous prime is 201381866713. The next prime is 201381866753. The reversal of 201381866717 is 717668183102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121646790841 + 79735075876 = 348779^2 + 282374^2 .

It is a cyclic number.

It is not a de Polignac number, because 201381866717 - 2² = 201381866713 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201381866713) 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, 100690933358 + 100690933359.

It is an arithmetic number, because the mean of its divisors is an integer number (100690933359).

Almost surely, 2^201381866717 is an apocalyptic number.

It is an amenable number.

201381866717 is a deficient number, since it is larger than the sum of its proper divisors (1).

201381866717 is an equidigital number, since it uses as much as digits as its factorization.

201381866717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 201381866717 in words is "two hundred one billion, three hundred eighty-one million, eight hundred sixty-six thousand, seven hundred seventeen".