11133420161 has 2 divisors, whose sum is σ = 11133420162. Its totient is φ = 11133420160.

The previous prime is 11133420079. The next prime is 11133420163. The reversal of 11133420161 is 16102433111.

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., 7472565136 + 3660855025 = 86444^2 + 60505^2 .

It is a cyclic number.

It is not a de Polignac number, because 11133420161 - 2¹⁰ = 11133419137 is a prime.

It is a super-3 number, since 3×11133420161³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 11133420163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11133420163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5566710080 + 5566710081.

It is an arithmetic number, because the mean of its divisors is an integer number (5566710081).

Almost surely, 2^11133420161 is an apocalyptic number.

It is an amenable number.

11133420161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11133420161 is an equidigital number, since it uses as much as digits as its factorization.

11133420161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 11133420161 its reverse (16102433111), we get a palindrome (27235853272).

The spelling of 11133420161 in words is "eleven billion, one hundred thirty-three million, four hundred twenty thousand, one hundred sixty-one".