11111101010081 has 2 divisors, whose sum is σ = 11111101010082. Its totient is φ = 11111101010080.

The previous prime is 11111101009993. The next prime is 11111101010111. The reversal of 11111101010081 is 18001010111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9734655841681 + 1376445168400 = 3120041^2 + 1173220^2 .

It is an emirp because it is prime and its reverse (18001010111111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11111101010081 - 2¹⁴ = 11111100993697 is a prime.

It is a super-2 number, since 2×11111101010081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11111101010381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555550505040 + 5555550505041.

It is an arithmetic number, because the mean of its divisors is an integer number (5555550505041).

Almost surely, 2^{11111101010081} is an apocalyptic number.

It is an amenable number.

11111101010081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111101010081 is an equidigital number, since it uses as much as digits as its factorization.

11111101010081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 11111101010081 its reverse (18001010111111), we get a palindrome (29112111121192).

The spelling of 11111101010081 in words is "eleven trillion, one hundred eleven billion, one hundred one million, ten thousand, eighty-one".