11116610581 has 2 divisors, whose sum is σ = 11116610582. Its totient is φ = 11116610580.

The previous prime is 11116610569. The next prime is 11116610623. The reversal of 11116610581 is 18501661111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7511688900 + 3604921681 = 86670^2 + 60041^2 .

It is a cyclic number.

It is not a de Polignac number, because 11116610581 - 2¹³ = 11116602389 is a prime.

It is a super-2 number, since 2×11116610581² (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 (11116610081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5558305290 + 5558305291.

It is an arithmetic number, because the mean of its divisors is an integer number (5558305291).

Almost surely, 2^11116610581 is an apocalyptic number.

It is an amenable number.

11116610581 is a deficient number, since it is larger than the sum of its proper divisors (1).

11116610581 is an equidigital number, since it uses as much as digits as its factorization.

11116610581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 31.

The spelling of 11116610581 in words is "eleven billion, one hundred sixteen million, six hundred ten thousand, five hundred eighty-one".