11165206781 has 2 divisors, whose sum is σ = 11165206782. Its totient is φ = 11165206780.

The previous prime is 11165206769. The next prime is 11165206813. The reversal of 11165206781 is 18760256111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7230781156 + 3934425625 = 85034^2 + 62725^2 .

It is an emirp because it is prime and its reverse (18760256111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11165206781 - 2¹⁰ = 11165205757 is a prime.

It is a super-2 number, since 2×11165206781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11165226781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5582603390 + 5582603391.

It is an arithmetic number, because the mean of its divisors is an integer number (5582603391).

Almost surely, 2^11165206781 is an apocalyptic number.

It is an amenable number.

11165206781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11165206781 is an equidigital number, since it uses as much as digits as its factorization.

11165206781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 38.

The spelling of 11165206781 in words is "eleven billion, one hundred sixty-five million, two hundred six thousand, seven hundred eighty-one".