11111111170109 has 2 divisors, whose sum is σ = 11111111170110. Its totient is φ = 11111111170108.

The previous prime is 11111111170063. The next prime is 11111111170129. The reversal of 11111111170109 is 90107111111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9115248607609 + 1995862562500 = 3019147^2 + 1412750^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111111170109 - 2¹⁶ = 11111111104573 is a prime.

It is a super-2 number, since 2×11111111170109² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111111170129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555555585054 + 5555555585055.

It is an arithmetic number, because the mean of its divisors is an integer number (5555555585055).

Almost surely, 2^{11111111170109} is an apocalyptic number.

It is an amenable number.

11111111170109 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111111170109 is an equidigital number, since it uses as much as digits as its factorization.

11111111170109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63, while the sum is 26.

The spelling of 11111111170109 in words is "eleven trillion, one hundred eleven billion, one hundred eleven million, one hundred seventy thousand, one hundred nine".