11122711661 has 2 divisors, whose sum is σ = 11122711662. Its totient is φ = 11122711660.

The previous prime is 11122711631. The next prime is 11122711679. The reversal of 11122711661 is 16611722111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8062962436 + 3059749225 = 89794^2 + 55315^2 .

It is a cyclic number.

It is not a de Polignac number, because 11122711661 - 2³⁰ = 10048969837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11122711631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5561355830 + 5561355831.

It is an arithmetic number, because the mean of its divisors is an integer number (5561355831).

Almost surely, 2^11122711661 is an apocalyptic number.

It is an amenable number.

11122711661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11122711661 is an equidigital number, since it uses as much as digits as its factorization.

11122711661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 29.

The spelling of 11122711661 in words is "eleven billion, one hundred twenty-two million, seven hundred eleven thousand, six hundred sixty-one".