17661120011 has 2 divisors, whose sum is σ = 17661120012. Its totient is φ = 17661120010.

The previous prime is 17661119981. The next prime is 17661120013. The reversal of 17661120011 is 11002116671.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 17661120011 - 2⁶ = 17661119947 is a prime.

Together with 17661120013, 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 (17661120013) 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, 8830560005 + 8830560006.

It is an arithmetic number, because the mean of its divisors is an integer number (8830560006).

Almost surely, 2^17661120011 is an apocalyptic number.

17661120011 is a deficient number, since it is larger than the sum of its proper divisors (1).

17661120011 is an equidigital number, since it uses as much as digits as its factorization.

17661120011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 26.

Adding to 17661120011 its reverse (11002116671), we get a palindrome (28663236682).

The spelling of 17661120011 in words is "seventeen billion, six hundred sixty-one million, one hundred twenty thousand, eleven".