11011111110981 has 48 divisors (see below), whose sum is σ = 17573876087040. Its totient is φ = 6608109150720.

The previous prime is 11011111110977. The next prime is 11011111110983. The reversal of 11011111110981 is 18901111111011.

It is not a de Polignac number, because 11011111110981 - 2² = 11011111110977 is a prime.

It is a super-2 number, since 2×11011111110981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011111110983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58035651 + ... + 58225071.

It is an arithmetic number, because the mean of its divisors is an integer number (366122418480).

Almost surely, 2^{11011111110981} is an apocalyptic number.

It is an amenable number.

11011111110981 is a deficient number, since it is larger than the sum of its proper divisors (6562764976059).

11011111110981 is a wasteful number, since it uses less digits than its factorization.

11011111110981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205986 (or 205983 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 27.

Adding to 11011111110981 its reverse (18901111111011), we get a palindrome (29912222221992).

The spelling of 11011111110981 in words is "eleven trillion, eleven billion, one hundred eleven million, one hundred ten thousand, nine hundred eighty-one".