11715461981809 has 2 divisors, whose sum is σ = 11715461981810. Its totient is φ = 11715461981808.

The previous prime is 11715461981807. The next prime is 11715461981843. The reversal of 11715461981809 is 90818916451711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7955558713600 + 3759903268209 = 2820560^2 + 1939047^2 .

It is a cyclic number.

It is not a de Polignac number, because 11715461981809 - 2¹ = 11715461981807 is a prime.

Together with 11715461981807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11715461981801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5857730990904 + 5857730990905.

It is an arithmetic number, because the mean of its divisors is an integer number (5857730990905).

Almost surely, 2^{11715461981809} is an apocalyptic number.

It is an amenable number.

11715461981809 is a deficient number, since it is larger than the sum of its proper divisors (1).

11715461981809 is an equidigital number, since it uses as much as digits as its factorization.

11715461981809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 61.

The spelling of 11715461981809 in words is "eleven trillion, seven hundred fifteen billion, four hundred sixty-one million, nine hundred eighty-one thousand, eight hundred nine".