11101111121161 has 2 divisors, whose sum is σ = 11101111121162. Its totient is φ = 11101111121160.

The previous prime is 11101111121147. The next prime is 11101111121341. The reversal of 11101111121161 is 16112111110111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11093462569225 + 7648551936 = 3330685^2 + 87456^2 .

It is a cyclic number.

It is not a de Polignac number, because 11101111121161 - 2³³ = 11092521186569 is a prime.

It is not a weakly prime, because it can be changed into another prime (11101111121101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550555560580 + 5550555560581.

It is an arithmetic number, because the mean of its divisors is an integer number (5550555560581).

Almost surely, 2^{11101111121161} is an apocalyptic number.

It is an amenable number.

11101111121161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11101111121161 is an equidigital number, since it uses as much as digits as its factorization.

11101111121161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 19.

Adding to 11101111121161 its reverse (16112111110111), we get a palindrome (27213222231272).

The spelling of 11101111121161 in words is "eleven trillion, one hundred one billion, one hundred eleven million, one hundred twenty-one thousand, one hundred sixty-one".