11661321223 has 2 divisors, whose sum is σ = 11661321224. Its totient is φ = 11661321222.

The previous prime is 11661321179. The next prime is 11661321239. The reversal of 11661321223 is 32212316611.

It is a strong prime.

It is an emirp because it is prime and its reverse (32212316611) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11661321223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11661321191 and 11661321200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11661321253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5830660611 + 5830660612.

It is an arithmetic number, because the mean of its divisors is an integer number (5830660612).

Almost surely, 2^11661321223 is an apocalyptic number.

11661321223 is a deficient number, since it is larger than the sum of its proper divisors (1).

11661321223 is an equidigital number, since it uses as much as digits as its factorization.

11661321223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

Adding to 11661321223 its reverse (32212316611), we get a palindrome (43873637834).

The spelling of 11661321223 in words is "eleven billion, six hundred sixty-one million, three hundred twenty-one thousand, two hundred twenty-three".