11111101010197 has 2 divisors, whose sum is σ = 11111101010198. Its totient is φ = 11111101010196.

The previous prime is 11111101010123. The next prime is 11111101010201. The reversal of 11111101010197 is 79101010111111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6240048964081 + 4871052046116 = 2498009^2 + 2207046^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111101010197 - 2²⁷ = 11110966792469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111101010297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555550505098 + 5555550505099.

It is an arithmetic number, because the mean of its divisors is an integer number (5555550505099).

Almost surely, 2^{11111101010197} is an apocalyptic number.

It is an amenable number.

11111101010197 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111101010197 is an equidigital number, since it uses as much as digits as its factorization.

11111101010197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63, while the sum is 25.

The spelling of 11111101010197 in words is "eleven trillion, one hundred eleven billion, one hundred one million, ten thousand, one hundred ninety-seven".