11103661661 has 2 divisors, whose sum is σ = 11103661662. Its totient is φ = 11103661660.

The previous prime is 11103661609. The next prime is 11103661663. The reversal of 11103661661 is 16616630111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11065777636 + 37884025 = 105194^2 + 6155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11103661661 is a prime.

It is a super-2 number, since 2×11103661661² (a number of 21 digits) contains 22 as substring.

Together with 11103661663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11103661663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5551830830 + 5551830831.

It is an arithmetic number, because the mean of its divisors is an integer number (5551830831).

Almost surely, 2^11103661661 is an apocalyptic number.

It is an amenable number.

11103661661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11103661661 is an equidigital number, since it uses as much as digits as its factorization.

11103661661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 11103661661 in words is "eleven billion, one hundred three million, six hundred sixty-one thousand, six hundred sixty-one".