11809556741 has 2 divisors, whose sum is σ = 11809556742. Its totient is φ = 11809556740.

The previous prime is 11809556687. The next prime is 11809556771. The reversal of 11809556741 is 14765590811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11293312900 + 516243841 = 106270^2 + 22721^2 .

It is a cyclic number.

It is not a de Polignac number, because 11809556741 - 2¹⁰ = 11809555717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11809556771) 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, 5904778370 + 5904778371.

It is an arithmetic number, because the mean of its divisors is an integer number (5904778371).

Almost surely, 2^11809556741 is an apocalyptic number.

It is an amenable number.

11809556741 is a deficient number, since it is larger than the sum of its proper divisors (1).

11809556741 is an equidigital number, since it uses as much as digits as its factorization.

11809556741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 47.

The spelling of 11809556741 in words is "eleven billion, eight hundred nine million, five hundred fifty-six thousand, seven hundred forty-one".