11011188445781 has 2 divisors, whose sum is σ = 11011188445782. Its totient is φ = 11011188445780.

The previous prime is 11011188445771. The next prime is 11011188445799. The reversal of 11011188445781 is 18754488111011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6458231103025 + 4552957342756 = 2541305^2 + 2133766^2 .

It is a cyclic number.

It is not a de Polignac number, because 11011188445781 - 2³⁰ = 11010114703957 is a prime.

It is a super-2 number, since 2×11011188445781² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11011188445771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505594222890 + 5505594222891.

It is an arithmetic number, because the mean of its divisors is an integer number (5505594222891).

Almost surely, 2^{11011188445781} is an apocalyptic number.

It is an amenable number.

11011188445781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011188445781 is an equidigital number, since it uses as much as digits as its factorization.

11011188445781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 286720, while the sum is 50.

The spelling of 11011188445781 in words is "eleven trillion, eleven billion, one hundred eighty-eight million, four hundred forty-five thousand, seven hundred eighty-one".